Fix Node & React Bugs

I’m handing over a mature Node.js + React codebase that’s become unstable, mainly on the backend. The most obvious pain point is API failures that interrupt core flows, so your first task will be to trace those calls, pinpoint the breakage, and patch them without introducing regressions... (Budget: $250 - $750 USD, Jobs: API Development, Docker, Frontend Development, Java, JavaScript, MongoDB, Node.js, NoSQL Couch & Mongo)