# config/packages/security.yaml
security:
    # ...

    firewalls:
        main:
            form_login:
                # ...
                default_target_path: after_login_route_name

public function afterloginRedirectAction(Request $request)
{

if($this->get('security.authorization_checker')->isGranted('ROLE_ADMIN'))
    {
        return $this->redirectToRoute('admin_homepage');
    }
    else if($this->get('security.authorization_checker')->isGranted('ROLE_USER'))
    {
        return $this->redirectToRoute('user_homepage');
    }
} ...