{
  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
        ];
        devDependencies = ps: with ps; [
          fastapi
          uvicorn
          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";
          };
        };

        cross = flake-utils.lib.eachDefaultSystem (crossSystem:
          let
            pkgs = import nixpkgs {
              localSystem = system;
              inherit crossSystem;
            };
          in
        {
          default = pkgs.python311Packages.buildPythonApplication {
            pname = "aci-backend";
            inherit version;
            propagatedBuildInputs = dependencies pkgs.python311Packages;
            src = ./backend;
          };
        
          docker = pkgs.dockerTools.buildLayeredImage {
            name = self.packages.${system}.cross.default.${crossSystem}.pname;
            tag = "latest";
            contents = [ self.packages.${system}.cross.default.${crossSystem} pkgs.busybox ];
            config = {
              Cmd = [ "/bin/app.py" ];
              WorkingDir = "/state";
            };
          };
        });
      };
      devShells.default = pkgs.mkShell {
        nativeBuildInputs = with pkgs; [
          (python311.withPackages devDependencies)
        ];
      };
    });
}