How would you build a search box that queries the API as the user types without creating noisy or stale results?

In production I would add rate limits, query normalization, cache where safe, and telemetry for slow searches and empty searches. Cancellation on the frontend reduces wasted UI work, but the backend still needs timeouts and cancellation tokens to stop database work where possible. I would monitor query frequency, top expensive patterns, search latency, and abandoned searches. Accessibility also matters: results updates need understandable focus and screen-reader behavior. I would test slow-network and rapid-typing scenarios so the implementation proves that stale responses cannot win the race.