I will reproduce and fix one focused bug in a TypeScript or Node.js codebase, then add regression tests so it stays fixed.

You receive: • Root-cause analysis and a focused, maintainable fix • Automated regression tests • Clear implementation notes and verification steps • A clean, PR-ready handoff

Best for API failures, broken integrations, type errors, edge cases, and test regressions. The fixed price covers one well-scoped issue in an existing repository. I will review the issue before starting and flag any scope change first.