Difficulties in Node

Answer with an example you really know. Good topics are unhandled Promise rejections, blocking the event loop, connection limits, hard-to-reproduce concurrency bugs or listener leaks.

Answer structure: symptom → diagnosis → concrete change → result → prevention.

Example to adapt: “An endpoint slowed down under more requests. Measurement showed expensive processing on the main thread. We moved the work out and measured the latency again.”

Pitfall: don't claim this example if you didn't live through it. Give the real scale of your problem and how you measured it, without making up percentages.