diff --git a/flake.nix b/flake.nix
index 26c7640..a68dccc 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,42 +5,45 @@
     nixpkgs.url = github:nixos/nixpkgs/nixos-23.05;
   };
 
-  outputs = { self, nixpkgs }:
-    let
-      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
-      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
-      pkgs = forAllSystems (system: nixpkgs.legacyPackages.${system});
-    in {
+  outputs = {
+    self,
+    nixpkgs,
+  } @ inputs: let
+    supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
+    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+    pkgs = forAllSystems (system: nixpkgs.legacyPackages.${system});
+  in {
+    # Formatter
+    formatter = forAllSystems (system: nixpkgs.legacyPackages.${system}.alejandra);
 
-      # Formatter
-      formatter = forAllSystems (system: nixpkgs.legacyPackages.${system}.alejandra);
+    # Packages
+    packages = forAllSystems (system: {
+      default = pkgs.${system}.poetry2nix.mkPoetryApplication {projectDir = self;};
+    });
 
-      # Packages
-      packages = forAllSystems (system: {
-        default = pkgs.${system}.poetry2nix.mkPoetryApplication { projectDir = self; };
-      });
+    # Dev Shell
+    devShells = forAllSystems (system: {
+      default = pkgs.${system}.mkShellNoCC {
+        shellHook = "echo Welcome to your nix-powered dev environment for dyn-gandi!";
 
-      # Dev Shell
-      devShells = forAllSystems (system: {
-        default = pkgs.${system}.mkShellNoCC {
-          shellHook = "Welcome to your nix-powered dev environment for dyn-gandi!";
+        packages = with pkgs.${system}; [
+          (poetry2nix.mkPoetryEnv {projectDir = self;})
+          poetry
+        ];
+      };
+    });
 
-          packages = with pkgs.${system}; [
-            (poetry2nix.mkPoetryEnv { projectDir = self; })
-            poetry
-          ];
+    # Run as apps
+    apps = forAllSystems (system: {
+      default = {
+        program = "${self.packages.${system}.default}/bin/dyn_gandi";
+        type = "app";
+      };
+    });
 
-        };
-      });
-
-      # Run as apps
-      apps = forAllSystems (system: {
-        default = {
-          program = "${self.packages.${system}.default}/bin/dyn_gandi";
-          type = "app";
-        };
-      });
-
-      homeManagerModules.default = import ./nix/hm-module.nix self;
-    };
+    # Home Manager Module
+    homeManagerModules.default = import ./nix/hm-module.nix self;
+    # NixOS Module
+    #nixosModules.default = import ./nix/module.nix inputs;
+  };
 }
diff --git a/nix/hm-module.nix b/nix/hm-module.nix
index b5611d2..c64c9b2 100644
--- a/nix/hm-module.nix
+++ b/nix/hm-module.nix
@@ -1,15 +1,72 @@
-{ config, lib, pkgs, ... }:
-let
-  cfg = config.dyn-gandi;
+self: {
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  cfg = config.services.dyn-gandi;
+  inherit (lib) mkIf mkEnableOption mkOption types;
 in {
+  options.services.dyn-gandi = {
+    enable = mkEnableOption "dyn-gandi";
 
-  options.dyn-gandi = {
-    enable = lib.mkEnableOption null // {
-      description = lib.mdDoc '''';
+    timer = lib.mkOption {
+      type = lib.types.int;
+      default = 0;
+      description = lib.mdDoc ''
+        The time intervall in seconds the script should be repeated.
+        0 disables automatic starts.
+      '';
+    };
+
+    settings = mkOption {
+      type = with types; let
+        valueType = nullOr (oneOf [
+          bool
+          int
+          float
+          str
+          path
+          (attrsOf valueType)
+          (listOf valueType)
+        ]);
+      in
+        valueType;
+
+      default = {api = {"example.com" = ["@" "www"];};};
+      example = {
+        General = {
+          disabledTrayIcon = true;
+          showStartupLaunchMessage = false;
+        };
+      };
+      description = '''';
     };
   };
 
-  config = lib.mkIf cfg.enable {
+  config = mkIf cfg.enable {
+    home.packages = [self.packages.x86_64-linux.default];
 
-};
-}
\ No newline at end of file
+    xdg.configFile."dyn-gandi/config.json" = {
+      text = builtins.toJSON cfg.settings;
+    };
+
+    systemd.user.services.dyn-gandi =
+      mkIf cfg.timer
+      != 0 {
+        Unit = {
+          Description = "DNS Updater tool for Gandi.net";
+          After = ["graphical-session-pre.target"];
+          PartOf = ["graphical-session.target"];
+        };
+      };
+    systemd.user.timers.dyn-gandi = {
+      wantedBy = ["timers.target"];
+      timerConfig = {
+        OnBootSec = "0s";
+        OnUnitActiveSec = "${cfg.timer}s";
+        Unit = "dyn-gandi.service";
+      };
+    };
+  };
+}
diff --git a/nix/module.nix b/nix/module.nix
new file mode 100644
index 0000000..65366b6
--- /dev/null
+++ b/nix/module.nix
@@ -0,0 +1,16 @@
+inputs: { config, lib, pkgs, ... }:
+let
+  cfg = config.services.dyn-gandi;
+  inherit (lib) mkIf mkEnableOption;
+  #package = inputs.self.packages.${pkgs.stdenv.hostPlatform.system}.default;
+in {
+
+  options.services.dyn-gandi = {
+    enable = mkEnableOption null;
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ cfg.package ];
+  }
+
+}
\ No newline at end of file