Node.js API crashing in production.Fixed this session.

PM assigned in 10 minutes. Node.js specialist starts diagnosing within the hour. Common Node.js production crashes stem from: unhandled promise rejections that terminate the process in Node 15+, EventEmitter memory leaks from listeners attached inside request handlers, synchronous blocking operations starving the event loop, or heap memory exhaustion from unbounded in-memory caches. The engineer uses clinic.js, node --inspect, and your APM traces to isolate the root cause. Most Node.js API crashes are resolved within a single 4-hour session.

Yes, memory leak diagnosis is one of the most common Node.js requests. The engineer uses heapdump and Chrome DevTools heap snapshots taken before and after load to identify retained object graphs. Common sources: EventEmitter listeners not removed on request end, closures holding references to large objects inside middleware, third-party SDK instances recreated per request instead of shared, or Mongoose connection objects multiplied across serverless invocations. The fix typically involves restructuring the listener lifecycle or adding explicit cleanup on connection close.

Yes. The engineer profiles the API under realistic load using autocannon or Artillery, identifies the slowest routes with clinic flame, and applies targeted optimisations: connection pool sizing for the database client, Redis caching for hot read paths, response compression and streaming for large payloads, and moving synchronous CPU-bound operations to worker threads. Express middleware ordering is also audited - authentication and body parsing middleware placed incorrectly add latency to every request.

Yes. PM scopes the WebSocket implementation in the first 15 minutes: Socket.io or ws library choice based on your client requirements, event namespace design, authentication middleware for socket connections, and horizontal scaling considerations (Redis adapter for multi-instance deployments). The engineer implements the server-side socket logic, writes client integration code, and adds reconnection and error handling. Load testing confirms the socket layer handles the expected concurrent connection count.

Every QuickHire Node.js engineer passes a live debugging exercise on a broken Express API - real environment, time-limited, covering a memory leak scenario and a broken async middleware chain simultaneously. Written assessment covers: the Node.js event loop model, Promise and async/await error propagation, stream backpressure, cluster module usage, and common security pitfalls (prototype pollution, ReDoS). Portfolio review confirms production APIs with real traffic. Only the top 3% pass all stages.

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