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Interview question · Prompt Injection & Jailbreaks

Architect a prompt injection detection system for production and show how you would know it works.

Design signals that distinguish suspicious inputs, unauthorized proposals, blocked operations and confirmed exposure. Test response timing, evidence handling and monitoring health.

hardNewUpdated Nov 2026

Design signals that distinguish suspicious inputs, unauthorized proposals, blocked operations and confirmed exposure. Test response timing, evidence handling and monitoring health.

Make your first attempt

What would you say before reading the answer?

  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.

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What if · the follow-ups in this answer

The answer works through 4 follow-ups like an interviewer would

Noor operates a fictional support assistant that summarizes customer messages and sends replies under a scoped grant. The team needs actionable detection without copying every customer conversation into its logs.

  1. The alert volume falls to zero after a logging deployment. What do you check first?
  2. The model proposes a recipient absent from the latest message. Is that unauthorized?
  3. A log contains a source hash but the source changed. Can the investigator reconstruct the old input?
  4. What belongs in the operating runbook?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Premium opens every answer and ladder.

UP NEXT ON YOUR JOURNEY
Next in this trackWhat is a canary token in an LLM application, and what can it detect?Next in this trackHow do prompt injections hidden in images, audio and documents work, and how would you test for them?Next in this trackA safety bypass works in one language but not in English. What does that tell you, and what do you do?
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