diff --git a/modules/dev/cs.nix b/modules/dev/cs.nix
new file mode 100644
index 00000000..2e73b4c2
--- /dev/null
+++ b/modules/dev/cs.nix
@@ -0,0 +1,16 @@
+{ outputs, options, config, lib, pkgs, ...}:
+with lib;
+let
+  cfg = config.modules.dev.csharp;
+in
+{
+  options.modules.dev.csharp = {
+    enable = mkEnableOption false;
+  };
+
+  config = mkIf cfg.enable {
+    users.users.sako.packages = with pkgs; [
+      omnisharp-roslyn
+    ];
+  };
+}
diff --git a/modules/dev/default.nix b/modules/dev/default.nix
index 990d6550..cb5e620b 100644
--- a/modules/dev/default.nix
+++ b/modules/dev/default.nix
@@ -8,5 +8,6 @@
     ./nixd.nix
     ./nil.nix
     ./lua.nix
+    ./cs.nix
   ];
 }