diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..d94a27f
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,42 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  backend:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: backend
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+          cache: pip
+          cache-dependency-path: backend/requirements.txt
+
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install pytest pytest-asyncio httpx
+
+      - name: Run lint check
+        run: |
+          pip install ruff
+          ruff check app/
+        continue-on-error: true
+
+      - name: Run tests
+        run: |
+          if [ -d "tests" ] && [ "$(find tests -name 'test_*.py' | head -1)" ]; then
+            pytest tests/ -v
+          else
+            echo "No tests found — skipping"
+          fi