Node.js Backend Fix and Complete

I need an experienced Node.js backend developer to work on an existing codebase. The backend code is already written, but it needs to be understood, issues fixed, and remaining parts completed to ensure full functionality with our ready frontend.

Key Tasks:
- Understand existing JavaScript/Node.js backend code
- Fix performance issues and API errors
- Complete remaining parts of the backend
- Ensure full functionality with the existing frontend

Ideal Skills and Experience:
- Proficiency in JavaScript and Node.js
- Experience with backend development and troubleshooting
- Strong problem-solving skills
- Ability to work independently and meet deadlines

Looking for a freelancer who can start immediately and deliver quality work within the budget.