diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
new file mode 100644
index 000000000..9779822b0
--- /dev/null
+++ b/.github/workflows/pull-request.yml
@@ -0,0 +1,52 @@
+name: Format and Build
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+jobs:
+  fmt:
+    name: Formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v20
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: trilitech-jstz
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+      - name: Format (rustfmt)
+        run: nix develop --command bash -c "make fmt-rust-check"
+
+      - name: Format (prettier)
+        run: nix develop --command bash -c "make fmt-js-check"
+
+      - name: Format (Nix)
+        run: nix develop --command bash -c "make fmt-nix-check"
+
+  build-nix:
+    name: Build `jstz_kernel` (Nix)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v20
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: trilitech-jstz
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+      - name: Build `jstz_kernel`
+        run: nix build
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: kernel
+          path: result/lib
diff --git a/Makefile b/Makefile
index 67392295a..e35fa75a4 100644
--- a/Makefile
+++ b/Makefile
@@ -42,17 +42,32 @@ clean:
 	rm -f result
 	rm -rf logs
 
+.PHONY: fmt-nix-check
+fmt-nix-check:
+	@alejandra check ./
+
 .PHONY: fmt-nix
 fmt-nix:
 	@alejandra ./
 
+.PHONY: fmt-rust-check
+fmt-rust-check:
+	@cargo fmt --check
+
 .PHONY: fmt-rust
 fmt-rust:
 	@cargo fmt
 
+.PHONY: fmt-js-check
+fmt-js-check:
+	npm run check:format
+
 .PHONY: fmt-js
 fmt-js:
 	npm run format
 
 .PHONY: fmt
 fmt: fmt-nix fmt-rust fmt-js
+
+.PHONY: fmt-check
+fmt: fmt-nix-check fmt-rust-check fmt-js-check