NODE API Bug Fix

I need an experienced developer to fix some issues with our API.

Requirements:
- Expertise in JavaScript
- Experience in debugging APIs, particularly non-REST, non-GraphQL, and non-SOAP types
- Ability to identify and resolve authentication, data retrieval, and performance issues

Ideal Skills:
- Strong problem-solving skills
- Familiarity with various API protocols and security measures
- Experience with API testing and monitoring tools

Please share relevant experience and a brief approach.