Need help with CRM project (urgent)

I am currently working on an existing CRM web application and need an experienced developer to help me fix a few issues in the project.

The project is already developed, so I am NOT looking for someone to rebuild the CRM from scratch. I mainly need 1–2 hours of hands-on technical help from someone experienced with the existing stack.
What I need help with:

Identify and fix existing backend/API issues

Debug Express.js code

Resolve frontend-to-backend communication problems

Fix request/response or JSON-related issues

Check existing API logic and suggest corrections

Explain the root cause of the issues so I can continue working on the project myself

This is a short-term debugging/mentoring task, expected to take around 1–2 hours.

I would prefer someone who has strong experience with Express.js and React/Angular and is comfortable joining an existing codebase, understanding it quickly, and solving issues without unnecessary changes.

Please mention your relevant experience with Express.js/CRM projects and your availability for a 1–2 hour session.