Multi-User Chat System with Gemini/ChatGPT Integration

I'm looking for a developer to create a web-based chat system integrated with Gemini and ChatGPT. This system should support multiple users and chats, with a pricing model and rate limits applied per user.

Key Requirements:
- Web platform support
- Multi-user, multi-chat functionality
- Integration with Gemini and ChatGPT
- Ability to add additional data to chat messages: User ID and Timestamp or other data as may required
- Pricing model implementation
- Rate limiting per user

Ideal Skills and Experience:
- Experience with chat system development
- Familiarity with Gemini and ChatGPT APIs
- Strong web development skills
- Knowledge of implementing pricing models and rate limits