Node.js Backend interview practice

Event-loop fluency, streams, and production Node services — proving you understand what the runtime actually does under load.

Topics this interview probes

Event loop mechanics Streams & backpressure Worker threads Memory & leaks API design Observability in Node

A Node service degrades every few days and recovers on restart. Walk me through your diagnosis.
Explain backpressure in streams and design a file-processing endpoint that respects it.
When do you move work to worker threads, and what are the costs?

The live interviewer generates fresh, role-tailored questions — and drills down when your answers are vague.