{
  inputs = {
    nixpkgs.url = github:NixOS/nixpkgs/nixpkgs-unstable;
    flake-utils.url = github:numtide/flake-utils;
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
        };
        dependencies = ps: with ps; [
          fastapi
          uvicorn
          aoihttp
        ];
        devDependencies = ps: with ps; [
          fastapi
          uvicorn
          aiohttp
          python-lsp-server
        ];
        version = self.shortRev or self.dirtyShortDev or "dirty-inputs";
      in
    {
      packages = {
        default = pkgs.python311Packages.buildPythonApplication {
          pname = "aci-backend";
          inherit version;
          propagatedBuildInputs = dependencies pkgs.python311Packages;
          src = ./backend;
        };

        docker = pkgs.dockerTools.buildLayeredImage {
          name = self.packages.${system}.default.pname;
          tag = "latest";
          contents = [ self.packages.${system}.default pkgs.busybox ];
          config = {
            Cmd = [ "/bin/app.py" ];
            WorkingDir = "/state";
          };
        };

        extension = pkgs.stdenv.mkDerivation {
          name = "aci-extension.zip";
          inherit version;
          src = ./extension;
          phases = "installPhase";
          nativeBuildInputs = [ pkgs.zip ];
          installPhase = ''
          cd $src/
          zip -r $out *
          '';
        };
      };
      devShells.default = pkgs.mkShell {
        nativeBuildInputs = with pkgs; [
          (python311.withPackages devDependencies)
        ];
      };
    });
}