diff --git a/src/application.cpp b/src/application.cpp
new file mode 100644
index 0000000..4d79a74
--- /dev/null
+++ b/src/application.cpp
@@ -0,0 +1,58 @@
+module;
+#include <gtkmm.h>
+
+#include <print>
+export module larra.application;
+import larra.main_window;
+
+namespace larra {
+
+export struct Application : Gtk::Application {
+  Application() : Gtk::Application("org.larra.larra") {
+    Glib::set_application_name("Larra");
+  };
+  static auto create() -> Glib::RefPtr<Application> {
+    return Glib::make_refptr_for_instance<Application>(new Application{});  // NOLINT
+  };
+  auto on_startup() -> void final {
+    this->Gtk::Application::on_startup();
+    this->add_action("preferences", sigc::mem_fun(*this, &Application::OnClickPreferences));
+    this->add_action("accounts", sigc::mem_fun(*this, &Application::OnClickManageAccounts));
+    this->add_action("about", sigc::mem_fun(*this, &Application::OnClickAbout));
+
+    auto gmenu = Gio::Menu::create();
+    auto larraMenu = Gio::Menu::create();
+    larraMenu->append("Preferences", "app.preferences");
+    auto accountsMenu = Gio::Menu::create();
+    accountsMenu->append("Manage accounts", "app.accounts");
+    auto helpMenu = Gio::Menu::create();
+    helpMenu->append("About", "app.about");
+
+    gmenu->append_submenu("Larra", larraMenu);
+    gmenu->append_submenu("Accounts", accountsMenu);
+    gmenu->append_submenu("Help", helpMenu);
+    this->set_menubar(gmenu);
+  };
+
+  auto on_activate() -> void final {
+    auto win = new MainWindow{};  // NOLINT
+    this->add_window(*win);
+    win->signal_hide().connect([win] {
+      delete win;  // NOLINT
+    });
+    win->set_show_menubar();
+    win->set_visible(true);
+  };
+
+  auto OnClickPreferences() -> void {
+
+  };
+
+  auto OnClickManageAccounts() -> void {
+
+  };
+
+  auto OnClickAbout() -> void {};
+};
+
+}  // namespace larra
diff --git a/src/main.cpp b/src/main.cpp
index a536faf..37f6fe0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,10 +1,7 @@
-module;
-#include <gtkmm.h>
 export module larra.main;
-import larra.library;
-import larra.main_window;
+import larra.application;
 
 auto main(int argc, char* argv[]) -> int {
-  auto app = Gtk::Application::create("org.larra.larra");
-  return app->make_window_and_run<MainWindow>(argc, argv);
+  auto app = larra::Application::create();
+  return app->run(argc, argv);
 };
diff --git a/src/main_window.cpp b/src/main_window.cpp
index ab1caa9..b194dac 100644
--- a/src/main_window.cpp
+++ b/src/main_window.cpp
@@ -2,9 +2,20 @@ module;
 #include <gtkmm.h>
 export module larra.main_window;
 
-export struct MainWindow : public Gtk::Window {
+namespace larra {
+
+export struct MainWindow : Gtk::ApplicationWindow {
+  Gtk::Box main;
+
+  Gtk::Box leftPanel{Gtk::Orientation::VERTICAL};
+  Gtk::Box accounts{Gtk::Orientation::VERTICAL};
+
   MainWindow() {
-    this->set_title("XMPP Client");
-    this->set_default_size(200, 200);
-  };
+    this->set_title("Larra");
+    auto settings = Gtk::Settings::get_default();
+    this->main.append(this->leftPanel);
+    this->set_child(this->main);
+  }
 };
+
+}  // namespace larra