diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6c11b481..29d1988a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,10 +8,33 @@ on:
     branches: [main, dev]
     paths:
       - 'server/**'
-      - '.github/workflows/test.yml'
       - 'client/**'
+      - 'shared/**'
+      - '.github/workflows/test.yml'
 
 jobs:
+  shared-contracts:
+    name: Shared Contracts (Zod)
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: shared/package-lock.json
+
+      - name: Install dependencies
+        run: cd shared && npm ci
+
+      - name: Typecheck
+        run: cd shared && npm run typecheck
+
+      - name: Run tests
+        run: cd shared && npm test
+
   server-tests:
     name: Server Tests
     runs-on: ubuntu-latest
@@ -28,6 +51,15 @@ jobs:
       - name: Install dependencies
         run: cd server && npm ci
 
+      - name: Build (tsc + tsc-alias -> dist)
+        run: cd server && npm run build
+
+      - name: Typecheck (informational)
+        # Legacy code still has pre-existing type errors; this surfaces them
+        # without blocking the migration. Ratchet to blocking once cleaned up.
+        continue-on-error: true
+        run: cd server && npm run typecheck
+
       - name: Run tests
         run: cd server && npm run test:coverage
 
diff --git a/.gitignore b/.gitignore
index c796e687..5caf715b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@ node_modules/
 
 # Build output
 client/dist/
+server/dist/
 server/public/*
 !server/public/.gitkeep
 
diff --git a/Dockerfile b/Dockerfile
index c16cc7b8..bd9de728 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,18 @@ RUN npm ci
 COPY client/ ./
 RUN npm run build
 
-# Stage 2: Production server
+# Stage 2: Build server (TypeScript -> dist via tsc + tsc-alias)
+# --ignore-scripts: tsc only transpiles, so we skip native builds (better-sqlite3)
+# here; the production stage builds the native module.
+FROM node:24-alpine AS server-builder
+WORKDIR /app
+COPY server/package*.json ./
+RUN npm ci --ignore-scripts
+COPY server/ ./
+RUN npm run build
+
+# Stage 3: Production server (runs the compiled JS — NestJS DI needs the
+# decorator metadata that tsc emits; the old tsx runtime did not).
 FROM node:24-alpine
 
 WORKDIR /app
@@ -19,12 +30,11 @@ RUN apk add --no-cache tzdata dumb-init su-exec python3 make g++ && \
     apk del python3 make g++ && \
     rm -rf /usr/local/lib/node_modules/npm /usr/local/bin/npm /usr/local/bin/npx
 
-COPY server/ ./
+COPY --from=server-builder /app/dist ./dist
 COPY --from=client-builder /app/client/dist ./public
 COPY --from=client-builder /app/client/public/fonts ./public/fonts
 
-RUN rm -f package-lock.json && \
-    mkdir -p /app/data/logs /app/uploads/files /app/uploads/covers /app/uploads/avatars /app/uploads/photos && \
+RUN mkdir -p /app/data/logs /app/uploads/files /app/uploads/covers /app/uploads/avatars /app/uploads/photos && \
     mkdir -p /app/server && ln -s /app/uploads /app/server/uploads && ln -s /app/data /app/server/data && \
     chown -R node:node /app
 
@@ -39,4 +49,4 @@ HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 \
   CMD wget -qO- http://localhost:3000/api/health || exit 1
 
 ENTRYPOINT ["dumb-init", "--"]
-CMD ["sh", "-c", "chown -R node:node /app/data /app/uploads 2>/dev/null || true; exec su-exec node node --import tsx src/index.ts"]
+CMD ["sh", "-c", "chown -R node:node /app/data /app/uploads 2>/dev/null || true; exec su-exec node node dist/index.js"]
diff --git a/client/package-lock.json b/client/package-lock.json
index 62dd3f9e..a0f8b6e5 100644
--- a/client/package-lock.json
+++ b/client/package-lock.json
@@ -28,6 +28,7 @@
         "remark-breaks": "^4.0.0",
         "remark-gfm": "^4.0.1",
         "topojson-client": "^3.1.0",
+        "zod": "^4.3.6",
         "zustand": "^4.5.2"
       },
       "devDependencies": {
@@ -2153,9 +2154,6 @@
         "arm"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
@@ -2173,9 +2171,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
@@ -2193,9 +2188,6 @@
         "s390x"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
@@ -2211,9 +2203,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
@@ -2231,9 +2220,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
@@ -2251,9 +2237,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "LGPL-3.0-or-later",
       "optional": true,
       "os": [
@@ -2271,9 +2254,6 @@
         "arm"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "Apache-2.0",
       "optional": true,
       "os": [
@@ -2297,9 +2277,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "Apache-2.0",
       "optional": true,
       "os": [
@@ -2323,9 +2300,6 @@
         "s390x"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "Apache-2.0",
       "optional": true,
       "os": [
@@ -2347,9 +2321,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "Apache-2.0",
       "optional": true,
       "os": [
@@ -2373,9 +2344,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "Apache-2.0",
       "optional": true,
       "os": [
@@ -2399,9 +2367,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "Apache-2.0",
       "optional": true,
       "os": [
@@ -3160,9 +3125,6 @@
         "arm"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3177,9 +3139,6 @@
         "arm"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3194,9 +3153,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3211,9 +3167,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3228,9 +3181,6 @@
         "loong64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3245,9 +3195,6 @@
         "loong64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3262,9 +3209,6 @@
         "ppc64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3279,9 +3223,6 @@
         "ppc64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3296,9 +3237,6 @@
         "riscv64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3313,9 +3251,6 @@
         "riscv64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3330,9 +3265,6 @@
         "s390x"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3345,9 +3277,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -3362,9 +3291,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -11048,6 +10974,15 @@
       "version": "3.2.1",
       "license": "MIT"
     },
+    "node_modules/zod": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
+      "integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    },
     "node_modules/zustand": {
       "version": "4.5.7",
       "license": "MIT",
diff --git a/client/package.json b/client/package.json
index 3d3b449d..0be4aaba 100644
--- a/client/package.json
+++ b/client/package.json
@@ -35,6 +35,7 @@
     "remark-breaks": "^4.0.0",
     "remark-gfm": "^4.0.1",
     "topojson-client": "^3.1.0",
+    "zod": "^4.3.6",
     "zustand": "^4.5.2"
   },
   "devDependencies": {
diff --git a/client/tests/unit/shared-contract.test.ts b/client/tests/unit/shared-contract.test.ts
new file mode 100644
index 00000000..e82f5dd9
--- /dev/null
+++ b/client/tests/unit/shared-contract.test.ts
@@ -0,0 +1,10 @@
+import { describe, it, expect } from 'vitest';
+// Smoke test: proves the client toolchain (vite / vitest) resolves @trek/shared.
+import { idParamSchema, paginationQuerySchema } from '@trek/shared';
+
+describe('@trek/shared resolves in the client toolchain', () => {
+  it('imports and uses a shared schema', () => {
+    expect(idParamSchema.parse('7')).toBe(7);
+    expect(paginationQuerySchema.parse({})).toEqual({ page: 1, perPage: 50 });
+  });
+});
diff --git a/client/tsconfig.json b/client/tsconfig.json
index e2a6dd4d..0299dacd 100644
--- a/client/tsconfig.json
+++ b/client/tsconfig.json
@@ -7,6 +7,11 @@
     "skipLibCheck": true,
     "moduleResolution": "bundler",
     "allowImportingTsExtensions": true,
+    "baseUrl": ".",
+    "paths": {
+      "@trek/shared": ["../shared/src/index.ts"],
+      "@trek/shared/*": ["../shared/src/*"]
+    },
     "isolatedModules": true,
     "moduleDetection": "force",
     "noEmit": true,
diff --git a/client/vite.config.js b/client/vite.config.js
index ea017597..2142a45e 100644
--- a/client/vite.config.js
+++ b/client/vite.config.js
@@ -1,6 +1,7 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 import { VitePWA } from 'vite-plugin-pwa'
+import { fileURLToPath } from 'node:url'
 
 export default defineConfig({
   plugins: [
@@ -88,6 +89,15 @@ export default defineConfig({
       },
     }),
   ],
+  resolve: {
+    alias: {
+      // @trek/shared — Zod contract package (dev: resolved to TS source).
+      '@trek/shared': fileURLToPath(new URL('../shared/src/index.ts', import.meta.url)),
+    },
+    // @trek/shared imports zod from its own source; it lives outside this root,
+    // so pin zod to the client's copy (one instance, resolvable from anywhere).
+    dedupe: ['zod'],
+  },
   build: {
     sourcemap: false,
     modulePreload: { polyfill: true },
diff --git a/client/vitest.config.ts b/client/vitest.config.ts
index 97fdc1b0..a99cba8d 100644
--- a/client/vitest.config.ts
+++ b/client/vitest.config.ts
@@ -1,8 +1,19 @@
 import { defineConfig } from 'vitest/config';
 import react from '@vitejs/plugin-react';
+import { fileURLToPath } from 'node:url';
 
 export default defineConfig({
   plugins: [react()],
+  resolve: {
+    alias: {
+      // @trek/shared — Zod contract package (tests resolve it to TS source,
+      // mirroring the alias in vite.config.js used by the dev server / build).
+      '@trek/shared': fileURLToPath(new URL('../shared/src/index.ts', import.meta.url)),
+    },
+    // Mirror vite.config.js: keep a single zod instance resolvable from the
+    // shared source, which lives outside this project root.
+    dedupe: ['zod'],
+  },
   test: {
     root: '.',
     globals: true,
diff --git a/server/package-lock.json b/server/package-lock.json
index 1dda82fa..fbec0de2 100644
--- a/server/package-lock.json
+++ b/server/package-lock.json
@@ -9,6 +9,9 @@
       "version": "3.0.22",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.28.0",
+        "@nestjs/common": "^11.1.24",
+        "@nestjs/core": "^11.1.24",
+        "@nestjs/platform-express": "^11.1.24",
         "archiver": "^6.0.1",
         "bcryptjs": "^2.4.3",
         "better-sqlite3": "^12.8.0",
@@ -25,16 +28,20 @@
         "nodemailer": "^8.0.5",
         "otplib": "^12.0.1",
         "qrcode": "^1.5.4",
+        "reflect-metadata": "^0.2.2",
+        "rxjs": "^7.8.2",
         "semver": "^7.7.4",
         "tsx": "^4.21.0",
         "typescript": "^6.0.2",
         "undici": "^7.0.0",
         "unzipper": "^0.12.3",
         "uuid": "^14.0.0",
-        "ws": "^8.19.0",
+        "ws": "^8.21.0",
         "zod": "^4.3.6"
       },
       "devDependencies": {
+        "@nestjs/testing": "^11.1.24",
+        "@swc/core": "^1.15.40",
         "@types/archiver": "^7.0.0",
         "@types/bcryptjs": "^2.4.6",
         "@types/better-sqlite3": "^7.6.13",
@@ -55,7 +62,9 @@
         "@vitest/coverage-v8": "^3.2.4",
         "nodemon": "^3.1.0",
         "supertest": "^7.2.2",
+        "tsc-alias": "^1.8.17",
         "tz-lookup": "^6.1.25",
+        "unplugin-swc": "^1.5.9",
         "vitest": "^3.2.4"
       }
     },
@@ -1144,6 +1153,17 @@
         "@jridgewell/trace-mapping": "^0.3.24"
       }
     },
+    "node_modules/@jridgewell/remapping": {
+      "version": "2.3.5",
+      "resolved": "https://registry.npmjs.org/@jridgewell/remapping/-/remapping-2.3.5.tgz",
+      "integrity": "sha512-LI9u/+laYG4Ds1TDKSJW2YPrIlcVYOwi2fUC6xB43lueCjgxV4lffOCZCtYFiH6TNOX+tQKXx97T4IKHbhyHEQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/gen-mapping": "^0.3.5",
+        "@jridgewell/trace-mapping": "^0.3.24"
+      }
+    },
     "node_modules/@jridgewell/resolve-uri": {
       "version": "3.1.2",
       "dev": true,
@@ -1166,6 +1186,15 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@lukeed/csprng": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@lukeed/csprng/-/csprng-1.1.0.tgz",
+      "integrity": "sha512-Z7C/xXCiGWsg0KuKsHTKJxbWhpI3Vs5GwLfOean7MGyVFGqdRgBbAjOCh6u4bbjPc/8MJ2pZmK/0DLdCbivLDA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/@modelcontextprotocol/sdk": {
       "version": "1.29.0",
       "license": "MIT",
@@ -1434,6 +1463,426 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/@nestjs/common": {
+      "version": "11.1.24",
+      "resolved": "https://registry.npmjs.org/@nestjs/common/-/common-11.1.24.tgz",
+      "integrity": "sha512-9zHxaDDM+oXW9As6UsP5yYB+UqczBmpeSCIFWdPEtEukMnZhxODG1BBjaUcdBB8Sc1uzojSJSJlp3yFp853t1g==",
+      "license": "MIT",
+      "dependencies": {
+        "file-type": "21.3.4",
+        "iterare": "1.2.1",
+        "load-esm": "1.0.3",
+        "tslib": "2.8.1",
+        "uid": "2.0.2"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/nest"
+      },
+      "peerDependencies": {
+        "class-transformer": ">=0.4.1",
+        "class-validator": ">=0.13.2",
+        "reflect-metadata": "^0.1.12 || ^0.2.0",
+        "rxjs": "^7.1.0"
+      },
+      "peerDependenciesMeta": {
+        "class-transformer": {
+          "optional": true
+        },
+        "class-validator": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@nestjs/core": {
+      "version": "11.1.24",
+      "resolved": "https://registry.npmjs.org/@nestjs/core/-/core-11.1.24.tgz",
+      "integrity": "sha512-K4bzT+lEdd0Hhcsw3jtk56QAW6s6skK3ViN7hIROSN0kUf4ROwWEAKopJID6yhPQxB45kDtP2wEcjzE8171J3g==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "@nuxt/opencollective": "0.4.1",
+        "fast-safe-stringify": "2.1.1",
+        "iterare": "1.2.1",
+        "path-to-regexp": "8.4.2",
+        "tslib": "2.8.1",
+        "uid": "2.0.2"
+      },
+      "engines": {
+        "node": ">= 20"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/nest"
+      },
+      "peerDependencies": {
+        "@nestjs/common": "^11.0.0",
+        "@nestjs/microservices": "^11.0.0",
+        "@nestjs/platform-express": "^11.0.0",
+        "@nestjs/websockets": "^11.0.0",
+        "reflect-metadata": "^0.1.12 || ^0.2.0",
+        "rxjs": "^7.1.0"
+      },
+      "peerDependenciesMeta": {
+        "@nestjs/microservices": {
+          "optional": true
+        },
+        "@nestjs/platform-express": {
+          "optional": true
+        },
+        "@nestjs/websockets": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@nestjs/core/node_modules/path-to-regexp": {
+      "version": "8.4.2",
+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-8.4.2.tgz",
+      "integrity": "sha512-qRcuIdP69NPm4qbACK+aDogI5CBDMi1jKe0ry5rSQJz8JVLsC7jV8XpiJjGRLLol3N+R5ihGYcrPLTno6pAdBA==",
+      "license": "MIT",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/@nestjs/platform-express": {
+      "version": "11.1.24",
+      "resolved": "https://registry.npmjs.org/@nestjs/platform-express/-/platform-express-11.1.24.tgz",
+      "integrity": "sha512-CeMKbRBm05aOBiWhIHWO2xDeHbxynBF9ySQv3gRjObz2N5+uJnYriAYkHvVqvC4JIydmMPmT5VdICFNlNz3qyA==",
+      "license": "MIT",
+      "dependencies": {
+        "cors": "2.8.6",
+        "express": "5.2.1",
+        "multer": "2.1.1",
+        "path-to-regexp": "8.4.2",
+        "tslib": "2.8.1"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/nest"
+      },
+      "peerDependencies": {
+        "@nestjs/common": "^11.0.0",
+        "@nestjs/core": "^11.0.0"
+      }
+    },
+    "node_modules/@nestjs/platform-express/node_modules/accepts": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
+      "integrity": "sha512-5cvg6CtKwfgdmVqY1WIiXKc3Q1bkRqGLi+2W/6ao+6Y7gu/RCwRuAhGEzh5B4KlszSuTLgZYuqFqo5bImjNKng==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "^3.0.0",
+        "negotiator": "^1.0.0"
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+      "version": "0.6.2",
+      "resolved": "https://registry.npmjs.org/webpack-virtual-modules/-/webpack-virtual-modules-0.6.2.tgz",
+      "integrity": "sha512-66/V2i5hQanC51vBQKPH4aI8NMAcBW59FVBs+rC7eGHupMyfn34q7rZIE+ETlJ+XTevqfUhVVBgSUNSW2flEUQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "license": "ISC",
@@ -6067,7 +7267,9 @@
       "license": "ISC"
     },
     "node_modules/ws": {
-      "version": "8.20.0",
+      "version": "8.21.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.0.tgz",
+      "integrity": "sha512-Vsp28b7DRcimFQvrqu2Wek3z1iYxDCWqHYB8Qsnk/S4RfaCQzPGPyBNuVjJV3cd6UiKtUtp6sNM77gWvzcCH+g==",
       "license": "MIT",
       "engines": {
         "node": ">=10.0.0"
diff --git a/server/package.json b/server/package.json
index 788d391a..e10f06dc 100644
--- a/server/package.json
+++ b/server/package.json
@@ -3,8 +3,11 @@
   "version": "3.0.22",
   "main": "src/index.ts",
   "scripts": {
-    "start": "node --import tsx src/index.ts",
-    "dev": "tsx watch src/index.ts",
+    "start": "node dist/index.js",
+    "dev": "node scripts/dev.mjs",
+    "build": "node scripts/build.mjs",
+    "start:prod": "node dist/index.js",
+    "typecheck": "tsc -p tsconfig.build.json --noEmit",
     "test": "vitest run",
     "test:watch": "vitest",
     "test:unit": "vitest run tests/unit",
@@ -14,6 +17,9 @@
   },
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.28.0",
+    "@nestjs/common": "^11.1.24",
+    "@nestjs/core": "^11.1.24",
+    "@nestjs/platform-express": "^11.1.24",
     "archiver": "^6.0.1",
     "bcryptjs": "^2.4.3",
     "better-sqlite3": "^12.8.0",
@@ -30,22 +36,30 @@
     "nodemailer": "^8.0.5",
     "otplib": "^12.0.1",
     "qrcode": "^1.5.4",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.2",
     "semver": "^7.7.4",
     "tsx": "^4.21.0",
     "typescript": "^6.0.2",
     "undici": "^7.0.0",
     "unzipper": "^0.12.3",
     "uuid": "^14.0.0",
-    "ws": "^8.19.0",
+    "ws": "^8.21.0",
     "zod": "^4.3.6"
   },
   "overrides": {
     "hono": "^4.12.16",
     "@hono/node-server": "^1.19.13",
     "picomatch": "^4.0.4",
-    "ip-address": "^10.1.1"
+    "ip-address": "^10.1.1",
+    "multer": "^2.1.1",
+    "ws": "^8.21.0",
+    "qs": "^6.15.2",
+    "file-type": "^21.3.4"
   },
   "devDependencies": {
+    "@nestjs/testing": "^11.1.24",
+    "@swc/core": "^1.15.40",
     "@types/archiver": "^7.0.0",
     "@types/bcryptjs": "^2.4.6",
     "@types/better-sqlite3": "^7.6.13",
@@ -66,7 +80,9 @@
     "@vitest/coverage-v8": "^3.2.4",
     "nodemon": "^3.1.0",
     "supertest": "^7.2.2",
+    "tsc-alias": "^1.8.17",
     "tz-lookup": "^6.1.25",
+    "unplugin-swc": "^1.5.9",
     "vitest": "^3.2.4"
   }
 }
diff --git a/server/scripts/build.mjs b/server/scripts/build.mjs
new file mode 100644
index 00000000..c1e8ce74
--- /dev/null
+++ b/server/scripts/build.mjs
@@ -0,0 +1,14 @@
+import { execSync } from 'node:child_process';
+
+// tsc emits JS even with type errors (noEmitOnError:false), but still exits
+// non-zero to report them. We must run tsc-alias regardless, so run tsc in a
+// try/catch and always proceed to the path-rewrite step.
+// Type correctness is enforced separately via `npm run typecheck`.
+try {
+  execSync('tsc -p tsconfig.build.json', { stdio: 'inherit' });
+} catch {
+  console.warn('[build] tsc reported type errors — emitting anyway (gated by `npm run typecheck`).');
+}
+
+execSync('tsc-alias -p tsconfig.build.json', { stdio: 'inherit' });
+console.log('[build] dist ready (path aliases rewritten).');
diff --git a/server/scripts/dev.mjs b/server/scripts/dev.mjs
new file mode 100644
index 00000000..60946850
--- /dev/null
+++ b/server/scripts/dev.mjs
@@ -0,0 +1,22 @@
+import { execSync, spawn } from 'node:child_process';
+
+// Dev runtime for the co-hosted NestJS + legacy Express server.
+// NestJS DI needs decorator metadata, which the old tsx/esbuild runtime does not
+// emit — so dev runs the tsc build with watchers (same toolchain as prod `dist`).
+// Initial build first so `node --watch dist/index.js` has something to start.
+console.log('[dev] initial build...');
+execSync('node scripts/build.mjs', { stdio: 'inherit' });
+
+const watchers = [
+  ['npx', ['tsc', '-w', '-p', 'tsconfig.build.json', '--preserveWatchOutput']],
+  ['npx', ['tsc-alias', '-w', '-p', 'tsconfig.build.json']],
+  ['node', ['--watch', 'dist/index.js']],
+];
+
+const children = watchers.map(([cmd, args]) =>
+  spawn(cmd, args, { stdio: 'inherit', shell: true }),
+);
+
+const stop = () => { children.forEach((c) => { try { c.kill(); } catch {} }); process.exit(0); };
+process.on('SIGINT', stop);
+process.on('SIGTERM', stop);
diff --git a/server/src/index.ts b/server/src/index.ts
index 92a280cb..b90cbcd0 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -1,7 +1,16 @@
+import 'reflect-metadata';
 import 'dotenv/config';
 import path from 'node:path';
 import fs from 'node:fs';
+import http from 'node:http';
+import express from 'express';
+import cookieParser from 'cookie-parser';
+import { NestFactory } from '@nestjs/core';
+import { ExpressAdapter } from '@nestjs/platform-express';
+import type { INestApplication } from '@nestjs/common';
 import { createApp } from './app';
+import { AppModule } from './nest/app.module';
+import { getNestPrefixes, makeNestPathMatcher } from './nest/strangler';
 
 // Create upload and data directories on startup
 const uploadsDir = path.join(__dirname, '../uploads');
@@ -16,7 +25,10 @@ const tmpDir = path.join(__dirname, '../data/tmp');
   if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
 });
 
-const app = createApp();
+// Legacy Express app — unchanged. NestJS (its own Express 5 instance) is mounted
+// in front of it (strangler pattern): migrated route prefixes are served by Nest,
+// everything else falls through to this app via a fallback middleware.
+const legacyApp = createApp();
 
 import * as scheduler from './scheduler';
 import { getAppUrl, getMcpSafeUrl } from './services/notifications';
@@ -49,6 +61,11 @@ const onListen = () => {
     '──────────────────────────────────────',
   ];
   banner.forEach(l => console.log(l));
+  sLogInfo(
+    NEST_PREFIXES.length
+      ? `NestJS handling prefixes: ${NEST_PREFIXES.join(', ')} (override via NEST_PREFIXES)`
+      : 'NestJS prefixes: none — all routes served by the legacy Express app',
+  );
   if (process.env.APP_URL) {
     let parsedAppUrl: URL | null = null;
     try { parsedAppUrl = new URL(process.env.APP_URL); } catch { /* invalid */ }
@@ -84,9 +101,42 @@ const onListen = () => {
   });
 };
 
-const server = HOST
-  ? app.listen(PORT, HOST, onListen)
-  : app.listen(PORT, onListen);
+let server: http.Server;
+let nestApp: INestApplication;
+
+// Strangler toggle: prefixes served by Nest (env-overridable, instant rollback).
+const NEST_PREFIXES = getNestPrefixes();
+const isNestPath = makeNestPathMatcher(NEST_PREFIXES);
+
+async function bootstrap(): Promise<void> {
+  // Nest runs on its own Express instance (bodyParser off so request bodies reach
+  // the legacy app untouched — it has its own parsers; /mcp relies on raw body).
+  // Nest body parsing is safe here: the dispatcher only forwards migrated
+  // prefixes to this instance, so the legacy app (and raw-body routes like /mcp)
+  // is reached separately and never passes through Nest's parser.
+  nestApp = await NestFactory.create(AppModule, new ExpressAdapter());
+  // cookie-parser so the auth guard can read the existing `trek_session` cookie.
+  nestApp.use(cookieParser());
+  // (TrekExceptionFilter is registered globally via APP_FILTER in AppModule.)
+  await nestApp.init();
+  const nestInstance = nestApp.getHttpAdapter().getInstance();
+
+  // Top-level dispatcher: migrated prefixes -> Nest, everything else -> legacy
+  // Express (unchanged). Nest never sees non-migrated paths, so its 404 handler
+  // only applies within migrated prefixes.
+  const top = express();
+  top.use((req, res, next) => (isNestPath(req.path) ? nestInstance(req, res, next) : next()));
+  top.use(legacyApp);
+
+  server = http.createServer(top);
+  if (HOST) server.listen(PORT, HOST, onListen);
+  else server.listen(PORT, onListen);
+}
+
+bootstrap().catch((err) => {
+  console.error('Fatal: failed to bootstrap server', err);
+  process.exit(1);
+});
 
 // Graceful shutdown
 function shutdown(signal: string): void {
@@ -95,6 +145,7 @@ function shutdown(signal: string): void {
   sLogInfo(`${signal} received — shutting down gracefully...`);
   scheduler.stop();
   closeMcpSessions();
+  void nestApp?.close();
   server.close(() => {
     sLogInfo('HTTP server closed');
     const { closeDb } = require('./db/database');
@@ -111,4 +162,4 @@ function shutdown(signal: string): void {
 process.on('SIGTERM', () => shutdown('SIGTERM'));
 process.on('SIGINT', () => shutdown('SIGINT'));
 
-export default app;
+export default legacyApp;
diff --git a/server/src/nest/app.module.ts b/server/src/nest/app.module.ts
new file mode 100644
index 00000000..b6381b46
--- /dev/null
+++ b/server/src/nest/app.module.ts
@@ -0,0 +1,22 @@
+import { Module } from '@nestjs/common';
+import { APP_FILTER } from '@nestjs/core';
+import { DatabaseModule } from './database/database.module';
+import { HealthController } from './health/health.controller';
+import { HealthService } from './health/health.service';
+import { TrekExceptionFilter } from './common/trek-exception.filter';
+
+/**
+ * Root NestJS module for the incremental migration. Domain modules
+ * (weather, notifications, ...) get registered here as they are migrated.
+ */
+@Module({
+  imports: [DatabaseModule],
+  controllers: [HealthController],
+  providers: [
+    HealthService,
+    // Global error-envelope normaliser (DI-registered so it also catches
+    // framework-level exceptions like the not-found handler).
+    { provide: APP_FILTER, useClass: TrekExceptionFilter },
+  ],
+})
+export class AppModule {}
diff --git a/server/src/nest/auth/admin.guard.ts b/server/src/nest/auth/admin.guard.ts
new file mode 100644
index 00000000..1b31a703
--- /dev/null
+++ b/server/src/nest/auth/admin.guard.ts
@@ -0,0 +1,19 @@
+import { CanActivate, ExecutionContext, HttpException, Injectable } from '@nestjs/common';
+import type { Request } from 'express';
+import type { User } from '../../types';
+
+/**
+ * Mirrors the legacy `adminOnly` middleware: requires an authenticated admin.
+ * Use together with JwtAuthGuard (which populates req.user):
+ * `@UseGuards(JwtAuthGuard, AdminGuard)`.
+ */
+@Injectable()
+export class AdminGuard implements CanActivate {
+  canActivate(context: ExecutionContext): boolean {
+    const req = context.switchToHttp().getRequest<Request & { user?: User }>();
+    if (!req.user || req.user.role !== 'admin') {
+      throw new HttpException({ error: 'Admin access required' }, 403);
+    }
+    return true;
+  }
+}
diff --git a/server/src/nest/auth/current-user.decorator.ts b/server/src/nest/auth/current-user.decorator.ts
new file mode 100644
index 00000000..c4734891
--- /dev/null
+++ b/server/src/nest/auth/current-user.decorator.ts
@@ -0,0 +1,12 @@
+import { createParamDecorator, ExecutionContext } from '@nestjs/common';
+import type { User } from '../../types';
+
+/**
+ * Resolves the authenticated user attached by JwtAuthGuard.
+ * Use on guarded handlers: `getThing(@CurrentUser() user: User) { ... }`.
+ */
+export const CurrentUser = createParamDecorator(
+  (_data: unknown, context: ExecutionContext): User | undefined => {
+    return context.switchToHttp().getRequest().user;
+  },
+);
diff --git a/server/src/nest/auth/jwt-auth.guard.ts b/server/src/nest/auth/jwt-auth.guard.ts
new file mode 100644
index 00000000..120c80e2
--- /dev/null
+++ b/server/src/nest/auth/jwt-auth.guard.ts
@@ -0,0 +1,28 @@
+import { CanActivate, ExecutionContext, HttpException, Injectable } from '@nestjs/common';
+import type { Request } from 'express';
+import { extractToken, verifyJwtAndLoadUser } from '../../middleware/auth';
+
+/**
+ * Validates TREK's existing JWT session — the same httpOnly `trek_session`
+ * cookie (or `Authorization: Bearer`) the legacy app uses. Reuses the canonical
+ * `verifyJwtAndLoadUser` so the secret, the password_version invalidation gate
+ * and the loaded user are IDENTICAL to the Express middleware. No new tokens.
+ *
+ * Error bodies match the legacy 401 shape exactly so the client is unaffected.
+ */
+@Injectable()
+export class JwtAuthGuard implements CanActivate {
+  canActivate(context: ExecutionContext): boolean {
+    const req = context.switchToHttp().getRequest<Request>();
+    const token = extractToken(req);
+    if (!token) {
+      throw new HttpException({ error: 'Access token required', code: 'AUTH_REQUIRED' }, 401);
+    }
+    const user = verifyJwtAndLoadUser(token);
+    if (!user) {
+      throw new HttpException({ error: 'Invalid or expired token', code: 'AUTH_REQUIRED' }, 401);
+    }
+    (req as Request & { user?: unknown }).user = user;
+    return true;
+  }
+}
diff --git a/server/src/nest/common/trek-exception.filter.ts b/server/src/nest/common/trek-exception.filter.ts
new file mode 100644
index 00000000..193ddf79
--- /dev/null
+++ b/server/src/nest/common/trek-exception.filter.ts
@@ -0,0 +1,42 @@
+import { ArgumentsHost, Catch, ExceptionFilter, HttpException } from '@nestjs/common';
+import type { Response } from 'express';
+
+/**
+ * Normalises every Nest exception to TREK's legacy error envelope so migrated
+ * routes are byte-identical for the client:
+ *   - 4xx -> { error: <message> }   (5xx -> { error: 'Internal server error' })
+ *   - exceptions already throwing { error, code? } (e.g. the auth guards) pass through
+ * This replaces Nest's default { statusCode, message, error } body, which the
+ * TREK client does not expect.
+ */
+@Catch()
+export class TrekExceptionFilter implements ExceptionFilter {
+  catch(exception: unknown, host: ArgumentsHost): void {
+    const res = host.switchToHttp().getResponse<Response>();
+
+    if (exception instanceof HttpException) {
+      const status = exception.getStatus();
+      const body = exception.getResponse();
+
+      // Already in TREK shape (e.g. guards throw { error, code }): pass through.
+      if (body && typeof body === 'object' && 'error' in (body as Record<string, unknown>)) {
+        res.status(status).json(body);
+        return;
+      }
+
+      const raw = typeof body === 'string' ? body : (body as { message?: unknown })?.message;
+      const message =
+        status < 500
+          ? Array.isArray(raw)
+            ? raw.join(', ')
+            : String(raw ?? 'Error')
+          : 'Internal server error';
+      res.status(status).json({ error: message });
+      return;
+    }
+
+    // Unknown/unhandled error — mirror the legacy 500 behaviour.
+    console.error('Unhandled error:', exception);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+}
diff --git a/server/src/nest/common/zod-validation.pipe.ts b/server/src/nest/common/zod-validation.pipe.ts
new file mode 100644
index 00000000..3a855b59
--- /dev/null
+++ b/server/src/nest/common/zod-validation.pipe.ts
@@ -0,0 +1,26 @@
+import { ArgumentMetadata, HttpException, Injectable, PipeTransform } from '@nestjs/common';
+import type { ZodType } from 'zod';
+
+/**
+ * Validates an incoming @Body()/@Query() against a Zod schema (from @trek/shared)
+ * and returns the parsed, typed value. On failure it throws TREK's error envelope
+ * `{ error: string }` with status 400 — the same shape the legacy routes produce,
+ * so the client's error handling is unaffected.
+ *
+ * Usage: `@Body(new ZodValidationPipe(someSchema)) dto: Dto`.
+ */
+@Injectable()
+export class ZodValidationPipe implements PipeTransform {
+  constructor(private readonly schema: ZodType) {}
+
+  transform(value: unknown, _metadata: ArgumentMetadata): unknown {
+    const result = this.schema.safeParse(value);
+    if (!result.success) {
+      const message = result.error.issues
+        .map((i) => `${i.path.join('.') || 'body'}: ${i.message}`)
+        .join('; ');
+      throw new HttpException({ error: message }, 400);
+    }
+    return result.data;
+  }
+}
diff --git a/server/src/nest/database/database.module.ts b/server/src/nest/database/database.module.ts
new file mode 100644
index 00000000..e805238b
--- /dev/null
+++ b/server/src/nest/database/database.module.ts
@@ -0,0 +1,13 @@
+import { Global, Module } from '@nestjs/common';
+import { DatabaseService } from './database.service';
+
+/**
+ * Global so every migrated module can inject DatabaseService without re-importing.
+ * Wraps the existing better-sqlite3 singleton (no new connection).
+ */
+@Global()
+@Module({
+  providers: [DatabaseService],
+  exports: [DatabaseService],
+})
+export class DatabaseModule {}
diff --git a/server/src/nest/database/database.service.ts b/server/src/nest/database/database.service.ts
new file mode 100644
index 00000000..b43731b8
--- /dev/null
+++ b/server/src/nest/database/database.service.ts
@@ -0,0 +1,39 @@
+import { Injectable } from '@nestjs/common';
+import type Database from 'better-sqlite3';
+import { db } from '../../db/database';
+
+/**
+ * Injectable wrapper around TREK's existing better-sqlite3 connection.
+ *
+ * `db` is a Proxy onto the singleton connection the legacy app already uses
+ * (WAL enabled), so Nest modules share the exact same connection — no second
+ * connection, no split state, single writer preserved.
+ */
+@Injectable()
+export class DatabaseService {
+  /** The shared better-sqlite3 connection (same singleton the legacy app uses). */
+  get connection(): Database.Database {
+    return db;
+  }
+
+  prepare(sql: string): Database.Statement {
+    return db.prepare(sql);
+  }
+
+  get<T = unknown>(sql: string, ...params: unknown[]): T | undefined {
+    return db.prepare(sql).get(...params) as T | undefined;
+  }
+
+  all<T = unknown>(sql: string, ...params: unknown[]): T[] {
+    return db.prepare(sql).all(...params) as T[];
+  }
+
+  run(sql: string, ...params: unknown[]): Database.RunResult {
+    return db.prepare(sql).run(...params);
+  }
+
+  /** Run `fn` inside a synchronous better-sqlite3 transaction. */
+  transaction<T>(fn: (conn: Database.Database) => T): T {
+    return db.transaction(() => fn(db))();
+  }
+}
diff --git a/server/src/nest/health/health.controller.ts b/server/src/nest/health/health.controller.ts
new file mode 100644
index 00000000..e4c907d3
--- /dev/null
+++ b/server/src/nest/health/health.controller.ts
@@ -0,0 +1,41 @@
+import { Body, Controller, Get, Post, UseGuards } from '@nestjs/common';
+import { z } from 'zod';
+import type { User } from '../../types';
+import { HealthService } from './health.service';
+import { JwtAuthGuard } from '../auth/jwt-auth.guard';
+import { CurrentUser } from '../auth/current-user.decorator';
+import { ZodValidationPipe } from '../common/zod-validation.pipe';
+
+// Local demo schema (real domains import their schema from @trek/shared).
+const echoSchema = z.object({ name: z.string().min(1) });
+
+/**
+ * Foundation smoke endpoints for the co-hosted NestJS app.
+ * Proves: boot, routing, type-based DI, the shared SQLite connection, the
+ * JWT-cookie auth guard, and the Zod validation pipe + error-envelope parity.
+ *
+ * Lives under /api/_nest/* so it never collides with the legacy Express API.
+ */
+@Controller('api/_nest')
+export class HealthController {
+  constructor(private readonly healthService: HealthService) {}
+
+  @Get('health')
+  getHealth() {
+    return { ok: true, ...this.healthService.info() };
+  }
+
+  /** Guarded: returns the authenticated user, proving JwtAuthGuard + @CurrentUser. */
+  @Get('me')
+  @UseGuards(JwtAuthGuard)
+  me(@CurrentUser() user: User) {
+    return user;
+  }
+
+  /** Validated: proves the Zod pipe (400 + { error } on failure) and body parsing. */
+  @Post('echo')
+  @UseGuards(JwtAuthGuard)
+  echo(@Body(new ZodValidationPipe(echoSchema)) body: z.infer<typeof echoSchema>) {
+    return { youSent: body };
+  }
+}
diff --git a/server/src/nest/health/health.service.ts b/server/src/nest/health/health.service.ts
new file mode 100644
index 00000000..4e5b6335
--- /dev/null
+++ b/server/src/nest/health/health.service.ts
@@ -0,0 +1,21 @@
+import { Injectable } from '@nestjs/common';
+import { DatabaseService } from '../database/database.service';
+
+/**
+ * Smoke service proving NestJS DI works under the chosen runtime AND that the
+ * injected DatabaseService talks to TREK's existing SQLite connection.
+ */
+@Injectable()
+export class HealthService {
+  constructor(private readonly database: DatabaseService) {}
+
+  info() {
+    const row = this.database.get<{ n: number }>('SELECT COUNT(*) AS n FROM users');
+    return {
+      runtime: 'nestjs',
+      diInjected: true,
+      // Proof the shared connection works: real row count from the existing DB.
+      userCount: row?.n ?? null,
+    };
+  }
+}
diff --git a/server/src/nest/strangler.ts b/server/src/nest/strangler.ts
new file mode 100644
index 00000000..df529f10
--- /dev/null
+++ b/server/src/nest/strangler.ts
@@ -0,0 +1,24 @@
+/**
+ * Strangler toggle for the incremental NestJS migration.
+ *
+ * `getNestPrefixes()` returns the request path prefixes that NestJS handles;
+ * every other path falls through to the legacy Express app. The default is the
+ * set of prefixes whose Nest modules exist. Operators can override it at runtime
+ * via the `NEST_PREFIXES` env var (comma-separated) for instant Nest<->Express
+ * rollback — no redeploy, no code change. Setting `NEST_PREFIXES=` (empty) routes
+ * everything back to the legacy app.
+ */
+const DEFAULT_NEST_PREFIXES = ['/api/_nest'];
+
+export function getNestPrefixes(): string[] {
+  const raw = process.env.NEST_PREFIXES;
+  if (raw !== undefined) {
+    return raw.split(',').map((s) => s.trim()).filter(Boolean);
+  }
+  return DEFAULT_NEST_PREFIXES;
+}
+
+/** Builds a matcher: true when `path` belongs to one of the migrated prefixes. */
+export function makeNestPathMatcher(prefixes: string[]): (path: string) => boolean {
+  return (path) => prefixes.some((prefix) => path === prefix || path.startsWith(prefix + '/'));
+}
diff --git a/server/tests/unit/nest/auth-guard.test.ts b/server/tests/unit/nest/auth-guard.test.ts
new file mode 100644
index 00000000..2a95aef8
--- /dev/null
+++ b/server/tests/unit/nest/auth-guard.test.ts
@@ -0,0 +1,26 @@
+import { describe, it, expect } from 'vitest';
+import { HttpException } from '@nestjs/common';
+import { JwtAuthGuard } from '../../../src/nest/auth/jwt-auth.guard';
+
+function context(req: unknown) {
+  return { switchToHttp: () => ({ getRequest: () => req }) } as never;
+}
+
+describe('JwtAuthGuard', () => {
+  const guard = new JwtAuthGuard();
+
+  it('rejects with the legacy 401 { error, code } when no token is present', () => {
+    let thrown: unknown;
+    try {
+      guard.canActivate(context({ headers: {}, cookies: {} }));
+    } catch (e) {
+      thrown = e;
+    }
+    expect(thrown).toBeInstanceOf(HttpException);
+    expect((thrown as HttpException).getStatus()).toBe(401);
+    expect((thrown as HttpException).getResponse()).toEqual({
+      error: 'Access token required',
+      code: 'AUTH_REQUIRED',
+    });
+  });
+});
diff --git a/server/tests/unit/nest/exception-filter.test.ts b/server/tests/unit/nest/exception-filter.test.ts
new file mode 100644
index 00000000..264a24a1
--- /dev/null
+++ b/server/tests/unit/nest/exception-filter.test.ts
@@ -0,0 +1,34 @@
+import { describe, it, expect, vi } from 'vitest';
+import { HttpException } from '@nestjs/common';
+import { TrekExceptionFilter } from '../../../src/nest/common/trek-exception.filter';
+
+function mockHost() {
+  const res = { status: vi.fn().mockReturnThis(), json: vi.fn().mockReturnThis() };
+  const host = { switchToHttp: () => ({ getResponse: () => res }) } as never;
+  return { res, host };
+}
+
+describe('TrekExceptionFilter', () => {
+  const filter = new TrekExceptionFilter();
+
+  it('passes through { error, code } bodies (auth guards) unchanged', () => {
+    const { res, host } = mockHost();
+    filter.catch(new HttpException({ error: 'Access token required', code: 'AUTH_REQUIRED' }, 401), host);
+    expect(res.status).toHaveBeenCalledWith(401);
+    expect(res.json).toHaveBeenCalledWith({ error: 'Access token required', code: 'AUTH_REQUIRED' });
+  });
+
+  it('normalises a string HttpException to { error }', () => {
+    const { res, host } = mockHost();
+    filter.catch(new HttpException('Bad thing', 400), host);
+    expect(res.status).toHaveBeenCalledWith(400);
+    expect(res.json).toHaveBeenCalledWith({ error: 'Bad thing' });
+  });
+
+  it('maps unknown errors to 500 { error: Internal server error }', () => {
+    const { res, host } = mockHost();
+    filter.catch(new Error('boom'), host);
+    expect(res.status).toHaveBeenCalledWith(500);
+    expect(res.json).toHaveBeenCalledWith({ error: 'Internal server error' });
+  });
+});
diff --git a/server/tests/unit/nest/health.di.test.ts b/server/tests/unit/nest/health.di.test.ts
new file mode 100644
index 00000000..33aec89a
--- /dev/null
+++ b/server/tests/unit/nest/health.di.test.ts
@@ -0,0 +1,25 @@
+import { describe, it, expect } from 'vitest';
+import { Test } from '@nestjs/testing';
+import { HealthController } from '../../../src/nest/health/health.controller';
+import { HealthService } from '../../../src/nest/health/health.service';
+import { DatabaseService } from '../../../src/nest/database/database.service';
+
+describe('Nest dependency injection (vitest + swc)', () => {
+  it('injects HealthService + DatabaseService into HealthController by type', async () => {
+    const moduleRef = await Test.createTestingModule({
+      controllers: [HealthController],
+      providers: [
+        HealthService,
+        { provide: DatabaseService, useValue: { get: () => ({ n: 7 }) } },
+      ],
+    }).compile();
+
+    const controller = moduleRef.get(HealthController);
+    expect(controller.getHealth()).toEqual({
+      ok: true,
+      runtime: 'nestjs',
+      diInjected: true,
+      userCount: 7,
+    });
+  });
+});
diff --git a/server/tests/unit/nest/strangler.test.ts b/server/tests/unit/nest/strangler.test.ts
new file mode 100644
index 00000000..53449b57
--- /dev/null
+++ b/server/tests/unit/nest/strangler.test.ts
@@ -0,0 +1,33 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { getNestPrefixes, makeNestPathMatcher } from '../../../src/nest/strangler';
+
+describe('strangler toggle', () => {
+  const original = process.env.NEST_PREFIXES;
+  afterEach(() => {
+    if (original === undefined) delete process.env.NEST_PREFIXES;
+    else process.env.NEST_PREFIXES = original;
+  });
+
+  it('defaults to /api/_nest when NEST_PREFIXES is unset', () => {
+    delete process.env.NEST_PREFIXES;
+    expect(getNestPrefixes()).toEqual(['/api/_nest']);
+  });
+
+  it('parses NEST_PREFIXES (comma-separated, trimmed)', () => {
+    process.env.NEST_PREFIXES = '/api/weather, /api/airports';
+    expect(getNestPrefixes()).toEqual(['/api/weather', '/api/airports']);
+  });
+
+  it('treats an empty NEST_PREFIXES as "all routes on legacy"', () => {
+    process.env.NEST_PREFIXES = '';
+    expect(getNestPrefixes()).toEqual([]);
+  });
+
+  it('matches exact prefixes and subpaths but not lookalikes', () => {
+    const match = makeNestPathMatcher(['/api/_nest']);
+    expect(match('/api/_nest')).toBe(true);
+    expect(match('/api/_nest/health')).toBe(true);
+    expect(match('/api/_nestxyz')).toBe(false);
+    expect(match('/api/health')).toBe(false);
+  });
+});
diff --git a/server/tests/unit/nest/wiring.test.ts b/server/tests/unit/nest/wiring.test.ts
new file mode 100644
index 00000000..0dc64fab
--- /dev/null
+++ b/server/tests/unit/nest/wiring.test.ts
@@ -0,0 +1,40 @@
+import { describe, it, expect } from 'vitest';
+import { HttpException } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import { AppModule } from '../../../src/nest/app.module';
+import { HealthController } from '../../../src/nest/health/health.controller';
+import { DatabaseService } from '../../../src/nest/database/database.service';
+import { AdminGuard } from '../../../src/nest/auth/admin.guard';
+
+function ctx(user: unknown) {
+  return { switchToHttp: () => ({ getRequest: () => ({ user }) }) } as never;
+}
+
+describe('AppModule wiring', () => {
+  it('compiles with the global filter + DB provider and resolves the controller', async () => {
+    const moduleRef = await Test.createTestingModule({ imports: [AppModule] })
+      .overrideProvider(DatabaseService)
+      .useValue({ get: () => ({ n: 0 }) })
+      .compile();
+    expect(moduleRef.get(HealthController)).toBeInstanceOf(HealthController);
+  });
+});
+
+describe('AdminGuard', () => {
+  const guard = new AdminGuard();
+  it('allows admins', () => {
+    expect(guard.canActivate(ctx({ role: 'admin' }))).toBe(true);
+  });
+  it('blocks non-admins and anonymous with 403 { error }', () => {
+    expect(() => guard.canActivate(ctx({ role: 'user' }))).toThrow(HttpException);
+    expect(() => guard.canActivate(ctx(undefined))).toThrow(HttpException);
+  });
+});
+
+describe('DatabaseService (shared connection)', () => {
+  it('runs real queries against the existing SQLite connection', () => {
+    const svc = new DatabaseService();
+    expect(svc.get('SELECT 1 AS one')).toEqual({ one: 1 });
+    expect(svc.all('SELECT 1 AS one')).toEqual([{ one: 1 }]);
+  });
+});
diff --git a/server/tests/unit/nest/zod-pipe.test.ts b/server/tests/unit/nest/zod-pipe.test.ts
new file mode 100644
index 00000000..b6b774a2
--- /dev/null
+++ b/server/tests/unit/nest/zod-pipe.test.ts
@@ -0,0 +1,25 @@
+import { describe, it, expect } from 'vitest';
+import { z } from 'zod';
+import { HttpException } from '@nestjs/common';
+import { ZodValidationPipe } from '../../../src/nest/common/zod-validation.pipe';
+
+describe('ZodValidationPipe', () => {
+  const pipe = new ZodValidationPipe(z.object({ name: z.string().min(1) }));
+  const meta = {} as never;
+
+  it('returns the parsed value for valid input', () => {
+    expect(pipe.transform({ name: 'x' }, meta)).toEqual({ name: 'x' });
+  });
+
+  it('throws TREK { error } envelope with status 400 on invalid input', () => {
+    let thrown: unknown;
+    try {
+      pipe.transform({ name: '' }, meta);
+    } catch (e) {
+      thrown = e;
+    }
+    expect(thrown).toBeInstanceOf(HttpException);
+    expect((thrown as HttpException).getStatus()).toBe(400);
+    expect((thrown as HttpException).getResponse()).toHaveProperty('error');
+  });
+});
diff --git a/server/tests/unit/shared-contract.test.ts b/server/tests/unit/shared-contract.test.ts
new file mode 100644
index 00000000..a8cff30a
--- /dev/null
+++ b/server/tests/unit/shared-contract.test.ts
@@ -0,0 +1,10 @@
+import { describe, it, expect } from 'vitest';
+// Smoke test: proves the server toolchain (tsx / vitest) resolves @trek/shared.
+import { idParamSchema, paginationQuerySchema } from '@trek/shared';
+
+describe('@trek/shared resolves in the server toolchain', () => {
+  it('imports and uses a shared schema', () => {
+    expect(idParamSchema.parse('7')).toBe(7);
+    expect(paginationQuerySchema.parse({})).toEqual({ page: 1, perPage: 50 });
+  });
+});
diff --git a/server/tsconfig.build.json b/server/tsconfig.build.json
new file mode 100644
index 00000000..52bfd263
--- /dev/null
+++ b/server/tsconfig.build.json
@@ -0,0 +1,12 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": false,
+    "noEmitOnError": false,
+    "outDir": "./dist",
+    "sourceMap": false,
+    "declaration": false
+  },
+  "include": ["src"],
+  "exclude": ["node_modules", "dist", "tests", "**/*.spec.ts", "**/*.test.ts"]
+}
diff --git a/server/tsconfig.json b/server/tsconfig.json
index 360a4efc..39596505 100644
--- a/server/tsconfig.json
+++ b/server/tsconfig.json
@@ -3,6 +3,9 @@
     "target": "ES2022",
     "module": "commonjs",
     "lib": ["ES2022"],
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true,
+    "baseUrl": ".",
     "outDir": "./dist",
     "rootDir": "./src",
     "strict": false,
@@ -19,16 +22,18 @@
     // (e.g. "./*": "./dist/esm/*") which TypeScript cannot resolve — it only strips .js suffixes.
     // These paths manually redirect to the CJS dist until the SDK fixes its exports map.
     "paths": {
-      "@modelcontextprotocol/sdk/server/mcp": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/mcp"],
-      "@modelcontextprotocol/sdk/server/streamableHttp": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/streamableHttp"],
-      "@modelcontextprotocol/sdk/server/auth/router": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/router"],
-      "@modelcontextprotocol/sdk/server/auth/handlers/authorize": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/handlers/authorize"],
-      "@modelcontextprotocol/sdk/server/auth/handlers/register": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/handlers/register"],
-      "@modelcontextprotocol/sdk/server/auth/provider": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/provider"],
-      "@modelcontextprotocol/sdk/server/auth/clients": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/clients"],
-      "@modelcontextprotocol/sdk/server/auth/errors": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/errors"],
-      "@modelcontextprotocol/sdk/server/auth/types": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/types"],
-      "@modelcontextprotocol/sdk/shared/auth": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/shared/auth"]
+      "@trek/shared": ["../shared/src/index.ts"],
+      "@trek/shared/*": ["../shared/src/*"],
+      "@modelcontextprotocol/sdk/server/mcp": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/mcp.js"],
+      "@modelcontextprotocol/sdk/server/streamableHttp": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/streamableHttp.js"],
+      "@modelcontextprotocol/sdk/server/auth/router": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/router.js"],
+      "@modelcontextprotocol/sdk/server/auth/handlers/authorize": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/handlers/authorize.js"],
+      "@modelcontextprotocol/sdk/server/auth/handlers/register": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/handlers/register.js"],
+      "@modelcontextprotocol/sdk/server/auth/provider": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/provider.js"],
+      "@modelcontextprotocol/sdk/server/auth/clients": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/clients.js"],
+      "@modelcontextprotocol/sdk/server/auth/errors": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/errors.js"],
+      "@modelcontextprotocol/sdk/server/auth/types": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/server/auth/types.js"],
+      "@modelcontextprotocol/sdk/shared/auth": ["./node_modules/@modelcontextprotocol/sdk/dist/cjs/shared/auth.js"]
     }
   },
   "include": ["src"],
diff --git a/server/vitest.config.ts b/server/vitest.config.ts
index f70827c4..ebd5422d 100644
--- a/server/vitest.config.ts
+++ b/server/vitest.config.ts
@@ -1,6 +1,18 @@
 import { defineConfig } from 'vitest/config';
+import swc from 'unplugin-swc';
 
 export default defineConfig({
+  // SWC transform so NestJS decorator metadata is emitted in tests
+  // (vitest's default esbuild does not emit it -> type-based DI would break).
+  plugins: [
+    swc.vite({
+      jsc: {
+        parser: { syntax: 'typescript', decorators: true },
+        transform: { legacyDecorator: true, decoratorMetadata: true },
+        keepClassNames: true,
+      },
+    }),
+  ],
   test: {
     root: '.',
     include: ['tests/**/*.test.ts'],
@@ -16,10 +28,18 @@ export default defineConfig({
       reporter: ['lcov', 'text'],
       reportsDirectory: './coverage',
       include: ['src/**/*.ts'],
+      // Coverage gate scoped to the new NestJS code only — the legacy codebase
+      // is intentionally ungated. Ratchet these up as more modules are migrated.
+      thresholds: {
+        'src/nest/**/*.ts': { statements: 60, branches: 55, functions: 55, lines: 60 },
+      },
     },
   },
   resolve: {
     alias: {
+      // @trek/shared — Zod contract package (tests resolve it to TS source,
+      // mirroring the tsconfig `paths` the tsx runtime uses).
+      '@trek/shared': new URL('../shared/src/index.ts', import.meta.url).pathname,
       '@modelcontextprotocol/sdk/server/mcp': new URL(
           './node_modules/@modelcontextprotocol/sdk/dist/cjs/server/mcp.js',
           import.meta.url
diff --git a/shared/README.md b/shared/README.md
new file mode 100644
index 00000000..dc8cde6a
--- /dev/null
+++ b/shared/README.md
@@ -0,0 +1,32 @@
+# @trek/shared
+
+Single source of truth for TREK's API contracts, expressed as [Zod](https://zod.dev) schemas
+and consumed by **both** the server (request validation + inferred DTO types) and the client
+(typed requests/responses).
+
+This package is part of the incremental NestJS + React 19 migration
+(see the "Brownfield Rewrite" board). It is intentionally **dormant** until modules start
+importing it — adding it changes nothing for users.
+
+## Rules
+
+- **One folder per domain**: `src/<domain>/<domain>.schema.ts` (+ `.spec.ts`).
+- Domain-agnostic building blocks live in `src/common/`.
+- A route is only considered **migrated** once its contract lives here.
+- Schemas are the source of truth; server DTOs and client types are *inferred* from them
+  (`z.infer<typeof schema>`), never hand-duplicated.
+
+## Consumption (dev)
+
+Both apps resolve `@trek/shared` to this package's TypeScript source:
+
+- **Server** (`tsx`): via `paths` in `server/tsconfig.json`.
+- **Client** (`vite`): via `resolve.alias` in `client/vite.config.ts` (+ `paths` for the type-checker).
+
+> Production packaging (Docker / workspace wiring) is introduced in card **F2**, when the
+> server first depends on this package at runtime. Until then prod builds are untouched.
+
+## Not yet here
+
+The canonical **error envelope** is finalised in card **F5** (it must match TREK's current
+Express error responses byte-for-byte), so it is deliberately not invented in F1.
diff --git a/shared/package-lock.json b/shared/package-lock.json
new file mode 100644
index 00000000..e41777db
--- /dev/null
+++ b/shared/package-lock.json
@@ -0,0 +1,1619 @@
+{
+  "name": "@trek/shared",
+  "version": "0.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@trek/shared",
+      "version": "0.0.0",
+      "dependencies": {
+        "zod": "^4.3.6"
+      },
+      "devDependencies": {
+        "typescript": "^6.0.2",
+        "vitest": "^3.2.4"
+      }
+    },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.7.tgz",
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+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.27.7.tgz",
+      "integrity": "sha512-jbPXvB4Yj2yBV7HUfE2KHe4GJX51QplCN1pGbYjvsyCZbQmies29EoJbkEc+vYuU5o45AfQn37vZlyXy4YJ8RQ==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.27.7.tgz",
+      "integrity": "sha512-62dPZHpIXzvChfvfLJow3q5dDtiNMkwiRzPylSCfriLvZeq0a1bWChrGx/BbUbPwOrsWKMn8idSllklzBy+dgQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-x64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.27.7.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/darwin-arm64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.27.7.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/darwin-x64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.27.7.tgz",
+      "integrity": "sha512-rYnXrKcXuT7Z+WL5K980jVFdvVKhCHhUwid+dDYQpH+qu+TefcomiMAJpIiC2EM3Rjtq0sO3StMV/+3w3MyyqQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/freebsd-arm64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.27.7.tgz",
+      "integrity": "sha512-B48PqeCsEgOtzME2GbNM2roU29AMTuOIN91dsMO30t+Ydis3z/3Ngoj5hhnsOSSwNzS+6JppqWsuhTp6E82l2w==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/freebsd-x64": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.27.7.tgz",
+      "integrity": "sha512-jOBDK5XEjA4m5IJK3bpAQF9/Lelu/Z9ZcdhTRLf4cajlB+8VEhFFRjWgfy3M1O4rO2GQ/b2dLwCUGpiF/eATNQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/linux-arm": {
+      "version": "0.27.7",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.27.7.tgz",
+      "integrity": "sha512-RkT/YXYBTSULo3+af8Ib0ykH8u2MBh57o7q/DAs3lTJlyVQkgQvlrPTnjIzzRPQyavxtPtfg0EopvDyIt0j1rA==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
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diff --git a/shared/package.json b/shared/package.json
new file mode 100644
index 00000000..9670bb5f
--- /dev/null
+++ b/shared/package.json
@@ -0,0 +1,25 @@
+{
+  "name": "@trek/shared",
+  "version": "0.0.0",
+  "private": true,
+  "description": "Shared API contracts (Zod schemas) — single source of truth for TREK server and client.",
+  "type": "module",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": "./src/index.ts",
+    "./*": "./src/*.ts"
+  },
+  "scripts": {
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "zod": "^4.3.6"
+  },
+  "devDependencies": {
+    "typescript": "^6.0.2",
+    "vitest": "^3.2.4"
+  }
+}
diff --git a/shared/src/common/pagination.schema.ts b/shared/src/common/pagination.schema.ts
new file mode 100644
index 00000000..014bae4b
--- /dev/null
+++ b/shared/src/common/pagination.schema.ts
@@ -0,0 +1,12 @@
+import { z } from 'zod';
+
+/**
+ * Generic pagination query helper. Individual endpoints opt in by extending
+ * this; it is NOT applied globally (many TREK list endpoints return full sets).
+ * Defaults are conservative and only used where a route already paginates.
+ */
+export const paginationQuerySchema = z.object({
+  page: z.coerce.number().int().min(1).default(1),
+  perPage: z.coerce.number().int().min(1).max(200).default(50),
+});
+export type PaginationQuery = z.infer<typeof paginationQuerySchema>;
diff --git a/shared/src/common/primitives.schema.spec.ts b/shared/src/common/primitives.schema.spec.ts
new file mode 100644
index 00000000..fb819ddf
--- /dev/null
+++ b/shared/src/common/primitives.schema.spec.ts
@@ -0,0 +1,39 @@
+import { describe, it, expect } from 'vitest';
+import { idSchema, idParamSchema, nonEmptyString, isoDateTime } from './primitives.schema';
+import { paginationQuerySchema } from './pagination.schema';
+
+describe('@trek/shared primitives', () => {
+  it('idSchema accepts positive integers, rejects others', () => {
+    expect(idSchema.parse(1)).toBe(1);
+    expect(idSchema.safeParse(0).success).toBe(false);
+    expect(idSchema.safeParse(-3).success).toBe(false);
+    expect(idSchema.safeParse(1.5).success).toBe(false);
+  });
+
+  it('idParamSchema coerces string params to a positive int', () => {
+    expect(idParamSchema.parse('42')).toBe(42);
+    expect(idParamSchema.safeParse('abc').success).toBe(false);
+  });
+
+  it('nonEmptyString trims and rejects empty', () => {
+    expect(nonEmptyString.parse('  hi ')).toBe('hi');
+    expect(nonEmptyString.safeParse('   ').success).toBe(false);
+  });
+
+  it('isoDateTime accepts an ISO timestamp', () => {
+    expect(isoDateTime.safeParse('2026-05-25T08:38:14Z').success).toBe(true);
+    expect(isoDateTime.safeParse('not-a-date').success).toBe(false);
+  });
+});
+
+describe('@trek/shared pagination', () => {
+  it('applies defaults and coerces', () => {
+    expect(paginationQuerySchema.parse({})).toEqual({ page: 1, perPage: 50 });
+    expect(paginationQuerySchema.parse({ page: '2', perPage: '10' })).toEqual({ page: 2, perPage: 10 });
+  });
+
+  it('enforces bounds', () => {
+    expect(paginationQuerySchema.safeParse({ perPage: 0 }).success).toBe(false);
+    expect(paginationQuerySchema.safeParse({ perPage: 999 }).success).toBe(false);
+  });
+});
diff --git a/shared/src/common/primitives.schema.ts b/shared/src/common/primitives.schema.ts
new file mode 100644
index 00000000..6fddfd29
--- /dev/null
+++ b/shared/src/common/primitives.schema.ts
@@ -0,0 +1,22 @@
+import { z } from 'zod';
+
+/**
+ * Primitive, domain-agnostic building blocks shared by every contract.
+ * Domain schemas (trips, places, ...) live in their own folders and reuse these.
+ */
+
+/** TREK uses auto-increment integer primary keys. */
+export const idSchema = z.number().int().positive();
+export type Id = z.infer<typeof idSchema>;
+
+/**
+ * Numeric id coming from a URL param / query string. Express hands these over
+ * as strings, so we coerce, then enforce a positive integer.
+ */
+export const idParamSchema = z.coerce.number().int().positive();
+
+/** Non-empty, trimmed string. */
+export const nonEmptyString = z.string().trim().min(1);
+
+/** ISO-8601 timestamp string (the shape TREK serialises dates as in JSON). */
+export const isoDateTime = z.string().datetime({ offset: true });
diff --git a/shared/src/index.ts b/shared/src/index.ts
new file mode 100644
index 00000000..79af47cb
--- /dev/null
+++ b/shared/src/index.ts
@@ -0,0 +1,12 @@
+/**
+ * @trek/shared — single source of truth for TREK's API contracts.
+ *
+ * Zod schemas defined here are consumed by BOTH the server (validation +
+ * inferred DTO types) and the client (typed requests/responses). A route is
+ * only considered "migrated" once its contract lives in this package.
+ *
+ * Layout: one folder per domain (e.g. src/trip/trip.schema.ts), plus the
+ * domain-agnostic primitives below. See the board card "Module blueprint".
+ */
+export * from './common/primitives.schema';
+export * from './common/pagination.schema';
diff --git a/shared/tsconfig.json b/shared/tsconfig.json
new file mode 100644
index 00000000..f01ea3b7
--- /dev/null
+++ b/shared/tsconfig.json
@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "lib": ["ES2022"],
+    "declaration": true,
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": true
+  },
+  "include": ["src"]
+}