Modern Bootstrap React Chat App

I'm seeking a skilled developer to create a high-end chat application utilizing React JS and Bootstrap. The chat app should focus on a modern design, ensuring a superior user experience.

Key Components of the Project:
- User Interface: The main emphasis is on a modern design. Your creativity and understanding of contemporary design trends will be crucial here.
- User Authentication: Implement user sign up and login functionalities using email and password. No need for complex systems like OAuth or Two-factor authentication at this stage.
- Database Management: Use MongoDB to store and manage user data efficiently.
- Security: The chat application must incorporate end-to-end encryption to guarantee users' safety during communication.

Ideal Skills Include:
- Proficiency in React JS and Bootstrap
- Experience with MongoDB
- Understanding of user interface design principles
- Knowledge of implementing encryption in applications

I am looking for a freelancer who can seamlessly merge a modern design with robust functionality and high-level security.

Utilize Socket.io for real-time messaging.