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..5fd2390
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,24 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1697723726,
+        "narHash": "sha256-SaTWPkI8a5xSHX/rrKzUe+/uVNy6zCGMXgoeMb7T9rg=",
+        "path": "/nix/store/4jfc6vrkmq7z5pb651jh5b4kra5f1kwp-source",
+        "rev": "7c9cc5a6e5d38010801741ac830a3f8fd667a7a0",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..4843d67
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,33 @@
+{
+  description = "Developer environment shell for ERICA SaaS";
+
+  inputs = {  };
+
+  outputs = { self, nixpkgs }:
+    let
+      # Helper to provide system-specific attributes
+      forAllSupportedSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+
+      supportedSystems = [
+        "aarch64-darwin"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "x86_64-linux"
+      ];
+    in
+
+    {
+      devShells = forAllSupportedSystems ({ pkgs }: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [
+            ruby_3_2
+            imagemagick
+            libyaml
+            cmake
+          ];
+        };
+      });
+    };
+}