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Interview question · Security Foundations & Threat Modeling

What would you log for a new service, and how do you write a detection with an acceptable false-positive rate?

Detection quality is decided before the first alert, by what you logged and how you set the threshold. The scored answer derives both from the questions an investigator will ask.

mediumNewPreparation tags: CrowdStrike, Microsoft, GoogleUpdated Nov 2026

Detection quality is decided before the first alert, by what you logged and how you set the threshold. The scored answer derives both from the questions an investigator will ask.

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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Every worked answer in all 17 topics, every lesson in every course, the full concept curriculum, the complete practice-test bank, and the downloadable security field guides.

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What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

A startup has no security logging and asks what to collect first with a small budget.

  1. What should logs answer?
  2. Which events matter first?
  3. Where should logs go?
  4. Which detections should come first?
  5. How do you keep it useful?
  6. What would you recommend first?

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 trackApply data minimisation and purpose limitation to a feature that sends user data to a model provider.Next in this trackHow do you run a security design review, and how do you write findings that engineers actually act on?Next in this trackTell me about a security risk you could not eliminate. How did you handle it?
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