Build an administration interface(Symfony/Twig) connected to backend APIS

We need to have administration interfaces to allow us to manage entities (e.g.: productions, companies, etc.) by talking to our authenticated backend APIs (OAuth2 JWT token via Auth0). -- The complete briefing/specifications will be provided after signing our NDA. -- We have built our platform as a single-page frontend application plugged onto backend RESTful APIs. The backend is fully separated from the frontend and every single (non-backend) operation (being read or write) is exclusively done through the authenticated APIs. We expect you to deliver a PHP Symfony 4.2+ / Twig monolithic stack. A GitLab repository will be created for you to work. You can use “bootstrap” -like themes for the UI to save time. On the backend, since we used the Doctrine ORM, we can expose you the PHP object classes we built so that you can use Symfony helpers to automatically generate CRUD controllers for you for instance. That is up to you. It has to work and has to be easily maintainable/extendable for future evolutions (to be either done by you as an additional project or by us). We expect a paginated table view for each entity with related entity filter wherever it’s supported. We are open to suggestions, feel free to shoot.