diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..06bb25b
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      NEXT_PUBLIC_SUPABASE_URL: https://placeholder.supabase.co
+      NEXT_PUBLIC_SUPABASE_ANON_KEY: placeholder-anon-key
+      SUPABASE_SERVICE_ROLE_KEY: placeholder-service-key
+      ANTHROPIC_API_KEY: placeholder-anthropic
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+      - run: npm ci
+      - run: npx tsc --noEmit
+      - run: npx next build