Seeking for a strong backed Java developer

I'm seeking a seasoned developer who can make me to understand and walk me through my "existing Java code base and it's functionally".

Key areas of focus:
-Making me understanding the existing code flow, debugging and testing
-Help me in my coding development
- Understanding the security protocols within the IDAnywhere SSO authentication
- Identifying suitable locations within the code base for new features

Ideal candidates should be:
- Proficient in Java with a strong understanding of API development, architecture and RESTFul services
- Experienced in working with API Gateways
- Familiar with IDAnywhere SSO authentication
- Able to explain complex technical concepts in an accessible manner
- Security-minded with a keen understanding of security protocols