diff --git a/devenv.nix b/devenv.nix
new file mode 100644
index 0000000..abbbb11
--- /dev/null
+++ b/devenv.nix
@@ -0,0 +1,27 @@
+{ pkgs, ... }: {
+  packages = with pkgs; [
+    fish
+    git
+    watchman
+  ];
+
+  languages = {
+    javascript = {
+      enable = true;
+      package = pkgs.nodejs_20;
+      npm = {
+        enable = true;
+        install.enable = true;
+      };
+    };
+
+    java = {
+      enable = true;
+      jdk.package = pkgs.jdk;
+    };
+  };
+
+  enterShell = ''
+    fish; exit
+  '';
+}
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..e65fefb
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,460 @@
+{
+  "nodes": {
+    "cachix": {
+      "inputs": {
+        "devenv": "devenv_2",
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "pre-commit-hooks": [
+          "devenv",
+          "pre-commit-hooks"
+        ]
+      },
+      "locked": {
+        "lastModified": 1712055811,
+        "narHash": "sha256-7FcfMm5A/f02yyzuavJe06zLa9hcMHsagE28ADcmQvk=",
+        "owner": "cachix",
+        "repo": "cachix",
+        "rev": "02e38da89851ec7fec3356a5c04bc8349cae0e30",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "cachix",
+        "type": "github"
+      }
+    },
+    "devenv": {
+      "inputs": {
+        "cachix": "cachix",
+        "flake-compat": "flake-compat_2",
+        "nix": "nix_2",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "pre-commit-hooks": "pre-commit-hooks"
+      },
+      "locked": {
+        "lastModified": 1715593316,
+        "narHash": "sha256-S7XatU9uV3q9bVBcg/ER0VMQcnPZprrVlN209ne7LDw=",
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "725c90407ef53cc2a1b53701c6d2d0745cf2484f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "devenv_2": {
+      "inputs": {
+        "flake-compat": [
+          "devenv",
+          "cachix",
+          "flake-compat"
+        ],
+        "nix": "nix",
+        "nixpkgs": "nixpkgs",
+        "poetry2nix": "poetry2nix",
+        "pre-commit-hooks": [
+          "devenv",
+          "cachix",
+          "pre-commit-hooks"
+        ]
+      },
+      "locked": {
+        "lastModified": 1708704632,
+        "narHash": "sha256-w+dOIW60FKMaHI1q5714CSibk99JfYxm0CzTinYWr+Q=",
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "2ee4450b0f4b95a1b90f2eb5ffea98b90e48c196",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "python-rewrite",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-compat_2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1689068808,
+        "narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "devenv",
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "nixpkgs": [
+          "devenv",
+          "cachix",
+          "devenv",
+          "nixpkgs"
+        ],
+        "nixpkgs-regression": "nixpkgs-regression"
+      },
+      "locked": {
+        "lastModified": 1712911606,
+        "narHash": "sha256-BGvBhepCufsjcUkXnEEXhEVjwdJAwPglCC2+bInc794=",
+        "owner": "domenkozar",
+        "repo": "nix",
+        "rev": "b24a9318ea3f3600c1e24b4a00691ee912d4de12",
+        "type": "github"
+      },
+      "original": {
+        "owner": "domenkozar",
+        "ref": "devenv-2.21",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
+    "nix-github-actions": {
+      "inputs": {
+        "nixpkgs": [
+          "devenv",
+          "cachix",
+          "devenv",
+          "poetry2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1688870561,
+        "narHash": "sha256-4UYkifnPEw1nAzqqPOTL2MvWtm3sNGw1UTYTalkTcGY=",
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "rev": "165b1650b753316aa7f1787f3005a8d2da0f5301",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nix-github-actions",
+        "type": "github"
+      }
+    },
+    "nix_2": {
+      "inputs": {
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "nixpkgs-regression": "nixpkgs-regression_2"
+      },
+      "locked": {
+        "lastModified": 1712911606,
+        "narHash": "sha256-BGvBhepCufsjcUkXnEEXhEVjwdJAwPglCC2+bInc794=",
+        "owner": "domenkozar",
+        "repo": "nix",
+        "rev": "b24a9318ea3f3600c1e24b4a00691ee912d4de12",
+        "type": "github"
+      },
+      "original": {
+        "owner": "domenkozar",
+        "ref": "devenv-2.21",
+        "repo": "nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1692808169,
+        "narHash": "sha256-x9Opq06rIiwdwGeK2Ykj69dNc2IvUH1fY55Wm7atwrE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9201b5ff357e781bf014d0330d18555695df7ba8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-regression": {
+      "locked": {
+        "lastModified": 1643052045,
+        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      }
+    },
+    "nixpkgs-regression_2": {
+      "locked": {
+        "lastModified": 1643052045,
+        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1710695816,
+        "narHash": "sha256-3Eh7fhEID17pv9ZxrPwCLfqXnYP006RKzSs0JptsN84=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "614b4613980a522ba49f0d194531beddbb7220d3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable_2": {
+      "locked": {
+        "lastModified": 1715668745,
+        "narHash": "sha256-xp62OkRkbUDNUc6VSqH02jB0FbOS+MsfMb7wL1RJOfA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9ddcaffecdf098822d944d4147dd8da30b4e6843",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1713361204,
+        "narHash": "sha256-TA6EDunWTkc5FvDCqU3W2T3SFn0gRZqh6D/hJnM02MM=",
+        "owner": "cachix",
+        "repo": "devenv-nixpkgs",
+        "rev": "285676e87ad9f0ca23d8714a6ab61e7e027020c6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "rolling",
+        "repo": "devenv-nixpkgs",
+        "type": "github"
+      }
+    },
+    "poetry2nix": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nix-github-actions": "nix-github-actions",
+        "nixpkgs": [
+          "devenv",
+          "cachix",
+          "devenv",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1692876271,
+        "narHash": "sha256-IXfZEkI0Mal5y1jr6IRWMqK8GW2/f28xJenZIPQqkY0=",
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "rev": "d5006be9c2c2417dafb2e2e5034d83fabd207ee3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "poetry2nix",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": [
+          "devenv",
+          "flake-compat"
+        ],
+        "flake-utils": "flake-utils_2",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "devenv",
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1713775815,
+        "narHash": "sha256-Wu9cdYTnGQQwtT20QQMg7jzkANKQjwBD9iccfGKkfls=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "2ac4dcbf55ed43f3be0bae15e181f08a57af24a4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "devenv": "devenv",
+        "nixpkgs": "nixpkgs_2",
+        "nixpkgs-stable": "nixpkgs-stable_2",
+        "systems": "systems_3"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_3": {
+      "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..ba33a51
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,59 @@
+{
+  inputs = {
+    nixpkgs.url = "github:cachix/devenv-nixpkgs/rolling";
+    nixpkgs-stable.url = "github:NixOS/nixpkgs/nixos-23.11";
+
+    systems.url = "github:nix-systems/default";
+    devenv = {
+      url = "github:cachix/devenv";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  nixConfig = {
+    extra-substituters = [
+      "https://devenv.cachix.org"
+    ];
+    extra-trusted-public-keys = [
+      "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw="
+    ];
+  };
+
+  outputs = { self, nixpkgs, nixpkgs-stable, devenv, systems, ... } @ inputs:
+    let
+      forEachSystem = nixpkgs.lib.genAttrs (import systems);
+    in
+    {
+      overlay = final: prev: {
+        stable = import inputs.nixpkgs-stable {
+          system = final.system;
+          config.allowUnfree = true;
+        };
+      };
+    } // {
+      packages = forEachSystem (system: {
+        devenv-up = self.devShells.${system}.default.config.procfileScript;
+      });
+
+      devShells = forEachSystem
+        (system:
+          let
+            # pkgs = nixpkgs.legacyPackages.${system};
+            pkgs = import nixpkgs {
+              inherit system;
+
+              overlays = [
+                self.overlay
+              ];
+            };
+          in
+          {
+            default = devenv.lib.mkShell {
+              inherit inputs pkgs;
+              modules = [
+                ./devenv.nix
+              ];
+            };
+          });
+    };
+}