I'm urgently in need of a seasoned Spring Boot developer with a track record of delivering quality applications. You should be well-versed in all areas of the Spring Boot framework and have a significant amount of experience in Java development. The ideal candidate should have a thorough understanding of user authentication and authorization, database connectivity and CRUD operations, and integration with third-party APIs.

Key requirements:
- An expert in Spring Boot
- Extensive experience in Java development
- Proven track record in user authentication and authorization systems
- Strong expertise in database connectivity and CRUD operations
- Skilled in integrating with third-party APIs

Please provide your portfolio with similar projects and a brief overview of your experience with Spring Boot. Only expert-level candidates will be considered.