Java Backend Development with Real-Time Communication

I'm looking for an experienced Java developer to create a robust backend application that interacts with a REACT UI and various databases. The application must also implement TCP socket communication with an event-based approach., Swagger APIS

Key Requirements:
- User Authentication & Authorization: The backend should provide secure access to the application ensuring only authorized users can interact with the system.
- CRUD Operations: The application should allow for basic Create, Read, Update, and Delete operations on the databases.
- Real-Time Data Synchronization: I need the data to be synchronized in real-time across the application. This is crucial for maintaining consistency for users.
- Integration with Third-Party APIs: The backend should be able to interact with third-party APIs, which will be essential for expanding the functionality of the system.

Ideal Skills and Experience:
- Proficiency in Java Development
- Previous experience with Spring Boot is a plus
- Strong understanding of event-based communication in TCP sockets
- Previous experience with Swagger for API documentation would be beneficial