diff --git a/pkgs/by-name/ha/happy-coder/package.nix b/pkgs/by-name/ha/happy-coder/package.nix
new file mode 100644
index 000000000000..1c412a51a033
--- /dev/null
+++ b/pkgs/by-name/ha/happy-coder/package.nix
@@ -0,0 +1,61 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  fetchYarnDeps,
+  yarnConfigHook,
+  yarnBuildHook,
+  yarnInstallHook,
+  nodejs,
+  makeWrapper,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "happy-coder";
+  version = "0.11.2";
+
+  src = fetchFromGitHub {
+    owner = "slopus";
+    repo = "happy-cli";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-WKzbpxHqE3Dxqy/PDj51tM9+Wl2Pallfrc5UU2MxNn8=";
+  };
+
+  yarnOfflineCache = fetchYarnDeps {
+    yarnLock = finalAttrs.src + "/yarn.lock";
+    hash = "sha256-3/qcbCJ+Iwc+9zPCHKsCv05QZHPUp0it+QR3z7m+ssw=";
+  };
+
+  nativeBuildInputs = [
+    nodejs
+    yarnConfigHook
+    yarnBuildHook
+    yarnInstallHook
+    makeWrapper
+  ];
+
+  # Currently `happy` requires `node` to start its daemon
+  postInstall = ''
+    wrapProgram $out/bin/happy \
+      --prefix PATH : ${
+        lib.makeBinPath [
+          nodejs
+        ]
+      }
+    wrapProgram $out/bin/happy-mcp \
+      --prefix PATH : ${
+        lib.makeBinPath [
+          nodejs
+        ]
+      }
+  '';
+
+  meta = {
+    description = "Mobile and web client wrapper for Claude Code and Codex with end-to-end encryption";
+    homepage = "https://github.com/slopus/happy-cli";
+    changelog = "https://github.com/slopus/happy-cli/releases/tag/v${finalAttrs.version}";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ onsails ];
+    mainProgram = "happy";
+  };
+})