Full-Stack Platform Development with React.js

I'm seeking an experienced full-stack developer to build a new platform from scratch. The platform will require:

- User authentication and management
- Real-time updates
- Administrative dashboards

The preferred frontend framework is React.js.

Ideal candidates should have:
- Strong expertise in React.js, Next.js, Node.js, and Firebase
- Proven experience in building platforms from the ground up
- A portfolio showcasing similar projects
- Focus on clean code, scalability, and performance

Please include relevant project examples in your bids.