Backend developer Needed

I'm looking for a skilled Full Stack Developer to work on the backend development of my project. This is a continuation of previous work, and several key features need to be implemented.

Key Features:
- User Authentication and Authorization: Ensure the system is secure and only accessible to authorized users.
- Payment Integration: Implement a secure payment system within the application.
- Data Storage and Retrieval: Manage and maintain the database, ensuring efficient storage and retrieval of necessary data.
- Real-Time Chat: Implement a one-on-one messaging system.

The ideal candidate should have:
- Extensive experience with Nest.js and backend development.
- Strong understanding of user authentication and authorization systems.
- Proficiency in payment gateway integration.
- Advanced knowledge of database design and management.
- Previous experience implementing real-time chat systems.

This project will require close collaboration and communication to ensure seamless integration with the current application. If you have the necessary skills and experience, I look forward to hearing from you.