Vibe codingHardvc-g581

Subject Ai prompt specLevel Senior–Staff~20 minCommon in Concurrency interviewsIndustries Software development, Technology

Question

You need an AI agent to build a worker that consumes jobs from a queue, processes each exactly once, and updates a Postgres row — across many concurrent workers. Write the prompt/spec that makes the concurrency correct the first time. What does a generic 'write a queue worker' prompt get wrong under load?

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.