diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..c99e2d3
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1758070117,
+        "narHash": "sha256-uLwwHFCZnT1c3N3biVe/0hCkag2GSrf9+M56+Okf+WY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e9b7f2ff62b35f711568b1f0866243c7c302028d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..68bcb67
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,54 @@
+{
+  description = "GlowTrack: reproducible devShell and app build outputs";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        # Developer shell with Node.js LTS, pnpm, git, jq
+        devShells.default = pkgs.mkShell {
+          packages = builtins.attrValues {
+            inherit (pkgs) nodejs_20 pnpm git jq;
+          };
+
+          # Tip: uncomment Playwright bits below once tests are wired (T007)
+          # packages = builtins.attrValues { inherit (pkgs) nodejs_20 pnpm git jq playwright-driver playwright-browsers; };
+          # shellHook = ''
+          #   export PLAYWRIGHT_BROWSERS_PATH=${pkgs.playwright-browsers}
+          # '';
+        };
+
+        # Package: static site output from apps/web
+        # This derivation copies a prebuilt site (build/ or dist/) from apps/web if present.
+        # It does not run networked installs, keeping the build pure. The actual build
+        # step is performed via pnpm in the dev shell (see T005/T030 for CI wiring).
+        packages.app = pkgs.stdenvNoCC.mkDerivation {
+          pname = "glowtrack-app";
+          version = "0.0.0";
+          src = ./.;
+
+          buildPhase = "true";
+          installPhase = ''
+            mkdir -p "$out"
+            if [ -d apps/web/build ]; then
+              cp -r apps/web/build/* "$out/"
+            elif [ -d apps/web/dist ]; then
+              cp -r apps/web/dist/* "$out/"
+            else
+              echo "No prebuilt app output detected. After scaffolding (T005), run 'pnpm -C apps/web build' to populate build/ or dist/." > "$out/README.txt"
+            fi
+          '';
+        };
+
+        # Make `.#default` point to the app package for convenience
+        packages.default = self.packages.${system}.app;
+      }
+    );
+}
diff --git a/result b/result
new file mode 120000
index 0000000..7edb235
--- /dev/null
+++ b/result
@@ -0,0 +1 @@
+/nix/store/a7d43vv7g79mi2da7b977vqy0cqnaa45-glowtrack-app-0.0.0
\ No newline at end of file
diff --git a/specs/001-glowtrack-a-mood/tasks.md b/specs/001-glowtrack-a-mood/tasks.md
index 9a7d606..46e78c9 100644
--- a/specs/001-glowtrack-a-mood/tasks.md
+++ b/specs/001-glowtrack-a-mood/tasks.md
@@ -25,7 +25,7 @@ Paths below are absolute to this repo.
   - Add placeholder README.md in each new folder.
   - Dependencies: none
 
-- [ ] T002 Initialize Nix flake (devShell + build outputs)
+- [X] T002 Initialize Nix flake (devShell + build outputs)
   - Create /home/jawz/Development/Projects/GlowTrack/flake.nix providing:
     - devShell with: nodejs (LTS 20+), pnpm, git, playwright browsers (via optional separate task), jq
     - packages.app building static site from /apps/web (pnpm build)