diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..be658da
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    env:
+      NODE_OPTIONS: --openssl-legacy-provider
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: yarn
+      - run: yarn install --frozen-lockfile
+      - run: yarn lint
+
+  test:
+    runs-on: ubuntu-latest
+    env:
+      NODE_OPTIONS: --openssl-legacy-provider
+      CI: true
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: yarn
+      - run: yarn install --frozen-lockfile
+      - run: yarn test --watchAll=false
diff --git a/package.json b/package.json
index b564970..4473348 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     "build": "NODE_OPTIONS=--openssl-legacy-provider react-app-rewired build",
     "test": "react-app-rewired test",
     "eject": "react-app-rewired eject",
+    "lint": "eslint src --ext .js,.jsx,.ts,.tsx",
     "render:shape": "node .claude/skills/deckbuilder-shape/scripts/render-shape.mjs"
   },
   "eslintConfig": {