Language Learning Platform Backend Development

I'm in need of a skilled backend developer for my language learning and dynamic storytelling platform. The frontend is complete and now I need the backend where users should be authenticated and able to access through an API that connects the frontend and backend.

Key Requirements:
- Implement user authentication system for Login and Registration
- Connect the frontend and backend seamlessly via API
- Ensure the project is completed ASAP

Please include your past work in your application, particularly any that is relevant to this project.