MERN Stack Backend Development

I'm seeking an experienced MERN stack developer to build a robust backend system for my application. The project primarily involves:

- Implementing user authentication (basic login/logout, OAuth integration, or two-factor authentication)
- Setting up data management and storage with MongoDB
- Developing and integrating APIs

Ideal candidates should have:

- Strong expertise in MongoDB and the MERN stack
- Experience with user authentication mechanisms
- Proficient in API development and integration

Please provide examples of similar work done.