Vibe codingHardvc-g487

Subject Ai verificationLevel Senior–Staff~20 minCommon in Algorithms & data structures interviewsIndustries Software development, Technology

Question

An endpoint was slow under load. You asked an AI agent to optimize it; it added a 60-second in-memory cache to the response, and p99 latency dropped dramatically in your load test. The team is happy. Before merging, how do you determine whether this actually fixed the root cause or just masked it — and what risks does the cache introduce?

What a strong answer looks like

Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it — tests, edge cases, reading critically — and how you’d re-prompt or decompose to get it right.

Learn the concepts

Describe your solution

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.