diff --git a/.gitignore b/.gitignore
index 62c2455..1a8b004 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,5 @@ open_ai_client-*.tar
 
 # Temporary files, for example, from tests.
 /tmp/
+.nix-hex
+.nix-mix
diff --git a/.zellij.kdl b/.zellij.kdl
new file mode 100644
index 0000000..5f31a20
--- /dev/null
+++ b/.zellij.kdl
@@ -0,0 +1,32 @@
+layout {
+	default_tab_template split_direction="horizontal" {
+		children
+		pane size=1 borderless=true {
+			plugin location="compact-bar"
+		}
+	}
+
+	tab name="1 code" focus=true {
+		pane split_direction="vertical" {
+			pane name="editor" size="80%" focus=true command="nvim" borderless=true
+			pane name="tests" size="20%" command="mix" {
+				args "test.interactive" "--stale"
+			}
+		}
+	}
+
+	// tab name="2 servers" {
+	// 	pane split_direction="vertical" {
+	// 		pane name="docker" command="docker" { 
+	// 			args "compose" "up"
+	// 		}
+	// 		pane name="web" command="iex" start_suspended=true {
+	// 			args "-S" "mix" "phx.server"
+	// 		}
+	// 	}
+	// }
+
+	tab name="2 git" {
+		pane name="git" command="lazygit" borderless=true
+	} 
+}
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..7acbf07
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1726560853,
+        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1728421091,
+        "narHash": "sha256-ZKLYFgFaMCQkyr1m3jMvx7g4Q6eBoFmEBLeu4QpsUD0=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ecf10b087d9c8902d85e71a51ab99427269fdcf7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "master",
+        "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..7450936
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,57 @@
+{
+  description = "A flake for building development environment of Phoenix project.";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/master";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      with pkgs; {
+        devShells.default = mkShell {
+          buildInputs = [
+            beam.interpreters.erlang_27
+            beam.packages.erlang_27.elixir_1_16
+            nodePackages.nodejs
+            flyctl
+          ]
+          ++ lib.optionals stdenv.isLinux [
+            # For ExUnit Notifier on Linux.
+            libnotify
+
+            # For file_system on Linux.
+            inotify-tools
+          ]
+          ++ lib.optionals stdenv.isDarwin [
+            # For ExUnit Notifier on macOS.
+            terminal-notifier
+
+            # For file_system on macOS.
+            darwin.apple_sdk.frameworks.CoreFoundation
+            darwin.apple_sdk.frameworks.CoreServices
+          ];
+
+          shellHook = ''
+            # allows mix to work on the local directory
+            mkdir -p .nix-mix
+            mkdir -p .nix-hex
+            export MIX_HOME=$PWD/.nix-mix
+            export HEX_HOME=$PWD/.nix-hex
+            export ERL_LIBS=$HEX_HOME/lib/erlang/lib
+
+            # concats PATH
+            export PATH=$MIX_HOME/bin:$PATH
+            export PATH=$MIX_HOME/escripts:$PATH
+            export PATH=$HEX_HOME/bin:$PATH
+
+            # enables history for IEx
+            export ERL_AFLAGS="-kernel shell_history enabled -kernel shell_history_path '\"$PWD/.erlang-history\"'"
+          '';
+        };
+      }
+    );
+}