Java Expert to understand/debug code

I am looking for a Java expert who can help me understand certain sections of java code within a tight timeline of 1-3 days. The purpose of this project is to gain a clear understanding of the code.

Skills and Experience:
- Strong proficiency in Java
- Excellent debugging skills
- Experience in code optimization
- Ability to quickly grasp complex code
- Attention to detail and ability to identify specific sections that need attention