Vibe codingHardvc-g511

Subject Ai code reviewLevel Senior–Staff~19 minCommon in Algorithms & data structures interviewsIndustries Software development, Technology

Question

An AI agent wrote this Pub/Sub-triggered Cloud Function (Go) that processes events and acks them. A teammate notices one malformed event spinning the function CPU all day and inflating cost. What is the failure mode and how should retries be handled?

1func Handle(ctx context.Context, msg PubSubMessage) error {2    var ev Event3    if err := json.Unmarshal(msg.Data, &ev); err != nil {4        return err // nack -> redeliver5    }6    if err := process(ev); err != nil {7        return err // nack -> redeliver8    }9    return nil // ack10}

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.