fixing backend bugs

I am looking for a skilled developer to fix backend bugs in my JavaScript application. The backend is written in JavaScript and there are errors in specific areas such as the database, user authentication, and APIs. I need these bugs fixed within a maximum of 2 days.

Ideal Skills and Experience:
- Strong proficiency in JavaScript
- Experience with backend development and bug fixing
- Knowledge of databases, user authentication, and APIs
- Ability to troubleshoot and debug code efficiently
- Attention to detail to identify and resolve all errors