Node.js / TypeScript App Diagnostics & Repair

Project: Fix Existing Node.js / TypeScript App (Amazon SP-API Integration)

Overview:
We have an existing, fully functional Node.js + TypeScript web application that integrates with the Amazon SP-API to pull, process, and analyze product data.

The system was working perfectly until a previous development team shut down our Google Cloud VMs. After turning the servers back on, the application no longer operates as expected. The exact cause of the issue is currently unknown.

We need an experienced backend developer to investigate and restore full functionality.

Tech Stack and Environment

Node.js + TypeScript

Amazon SP-API (ProductPricing, CatalogItems, Fees, etc.)

MongoDB database

Hosted on Google Cloud VMs (approximately 30 instances)

May use Redis or a job queue system for distributed processing

Frontend: React (TypeScript)

Responsibilities

Diagnose why the system stopped functioning after VM restart

Restore communication between backend services and worker VMs

Review and repair SP-API authentication, rate limiting, and data fetching

Identify any missing environment variables, startup scripts, or dependencies

Ensure data flows correctly from SP-API to MongoDB and frontend

Provide a brief technical summary of the fix

Ideal Candidate

Strong experience with Node.js and TypeScript

In-depth knowledge of Amazon SP-API integration

Familiarity with MongoDB and distributed architectures

Experience working with Google Cloud Platform (Compute Engine VMs)

Capable of debugging multi-server applications and asynchronous job systems

Project Status

All code and infrastructure already exist

No rebuild required — focus is on debugging and restoring functionality