Node.js Backend Debug & Upgrade

My production backend, built with Node.js and Express, has begun throwing API-level errors whenever it calls certain third-party services. I need someone who can dive into the existing SQL-based data layer, trace the root cause, and then patch or rewrite the integration logic so responses return cleanly and consistently.

The work will involve tracing stack traces, profiling slow SQL queries that may be compounding the issue, refreshing outdated code that interacts with external APIs, and writing automated tests to confirm nothing else breaks once the fixes go live. You are free to recommend better patterns, libraries, or small architectural tweaks as long as they stay compatible with the current stack.

Because the exact scope may expand once we uncover hidden bugs, I’m open to either an hourly engagement or a clearly defined fixed-price milestone plan.

Deliverables
• Short audit report summarising found issues and their root causes
• Refactored third-party integration modules with clear, well-commented code
• Optimised SQL queries where relevant, verified against the live database
• Test suite (unit or integration) proving the affected endpoints work as expected

If you are fluent in Node.js, Express, and SQL databases and have a knack for taming unpredictable APIs, let’s talk and get this backend running smoothly again.