Java Spring Boot Developer Needed

I'm looking for a capable Java Spring Boot backend developer, with a special emphasis on user authentication and authorization. Your tasks will comprise of:

- Designing and integrating a robust two-factor authentication system
- The two-factor authentication must employ the SMS methodology

Qualifications include substantial experience with Java Spring Boot, depth of knowledge in creating and managing secure user authentication systems, and a comprehensive understanding of two-factor authentication, preferably with SMS authentication.

Please provide examples of your prior work related to user authentication and two-factor authentication systems. I can't wait to collaborate with someone who's as enthusiastic about this project as I am!