Real-time Chat Application Development using Mern Stack

We are seeking an experienced full-stack developer to create a real-time chatting system using the MERN stack (MongoDB, Express.js, React.js, Node.js). The project involves building a robust and scalable application that supports instant messaging functionalities.

Key features required:
- User authentication (registration, login, logout)
- Real-time one-on-one and group messaging capabilities
- Display of active users and online/offline status
- Message history and retrieval
- Responsive user interface for various devices
- Secure communication protocols

The ideal candidate will have strong expertise in all components of the MERN stack and a proven track record in developing real-time applications. Experience with WebSocket libraries like Socket.IO is highly desirable.