diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 8f040bf..1d578c5 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -8,46 +8,22 @@ on:
   pull_request:
     branches: [main]
 
-# Run CI on all 3 latest OSes
 jobs:
-  build:
+  check:
     runs-on: ubuntu-latest
-
     steps:
-      - uses: actions/checkout@v2
-
-      - uses: purescript-contrib/setup-purescript@main
-        with:
-          purescript: "0.15.9"
-          purs-tidy: "0.10.0"
-          psa: "0.8.2"
-          spago: "unstable"
-
-      - name: Cache PureScript dependencies
-        uses: actions/cache@v2
-        with:
-          key: ${{ runner.os }}-spago-${{ hashFiles('**/*.dhall') }}
-          path: |
-            .spago
-            output
+      - uses: actions/checkout@v3
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
 
-      - name: Set up Node toolchain
-        uses: actions/setup-node@v2
-        with:
-          node-version: "18"
+      - name: "Nix check"
+        run: nix flake check
 
-      # Compile the library/project
-      #   censor-lib: ignore warnings emitted by dependencies
-      #   strict: convert warnings into errors
-      # Note: `purs-args` actually forwards these args to `psa`
-      - name: Build the project
+      - name: "Run tests"
         run: |
-          spago build --purs-args "--censor-lib --strict"
+          nix develop --command 'run-install'
+          nix develop --command 'run-test'
 
-      - name: Run tests
-        run: |
-          spago -x test.dhall test
+      - name: "Check format"
+        run: nix develop --command 'run-check-format'
 
-      - name: Check Formatting
-        run: |
-          purs-tidy check src test
diff --git a/flake.nix b/flake.nix
index e5f8648..acfb7ff 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,20 +6,59 @@
     purescript-overlay.inputs.nixpkgs.follows = "nixpkgs";
   };
 
-  outputs = { self, nixpkgs, flake-utils, purescript-overlay }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let
-        overlays = [ purescript-overlay.overlays.default ];
-        pkgs = import nixpkgs { inherit system overlays; };
-      in {
-        devShells.default = pkgs.mkShell {
-          buildInputs = with pkgs; [
-            purs
-            purs-tidy
-            purs-backend-es
-            nodejs
-            spago-unstable
-          ];
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    purescript-overlay,
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      overlays = [purescript-overlay.overlays.default];
+      pkgs = import nixpkgs {inherit system overlays;};
+      scripts = pkgs.symlinkJoin {
+        name = "scripts";
+        paths = pkgs.lib.mapAttrsToList pkgs.writeShellScriptBin {
+          run-install = ''
+            spago install
+          '';
+
+          run-test = ''
+            spago test
+          '';
+
+          run-check-format = ''
+            purs-tidy check src test
+          '';
         };
-      });
+      };
+    in {
+      devShells.default = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          scripts
+
+          # PureScript tools
+          purs
+          purs-tidy
+          purs-backend-es
+          spago-unstable
+          # Node
+          nodejs
+          # Nix
+          alejandra
+        ];
+      };
+
+      checks = {
+        format =
+          pkgs.runCommand "check-format"
+          {
+            buildInputs = with pkgs; [
+              alejandra
+            ];
+          } ''
+            ${pkgs.alejandra}/bin/alejandra --check ${./.}
+            touch $out
+          '';
+      };
+    });
 }