Java API's for User Authentication

I am seeking a Java developer to create a custom API that primarily focuses on user authentication.

Key Responsibilities:
- Develop a Java API that effectively handles user login and registration.
- Implement secure and scalable authentication mechanisms.
- Ensure seamless integration with a variety of front-end applications.

Skills and Experience:
- Proficiency in Java, with a strong understanding of API development.
- Proven experience in creating user authentication systems.
- Prior work with designing and implementing functional and secure APIs.
- Familiarity with OAuth2 and API key management will be a plus.
- An understanding of database connectivity is essential for this project.