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Interview question · Detection Engineering & Incident Response

How would you turn on Amazon GuardDuty across a 300-account AWS organisation, route its findings and tune it without blinding it?

Enabling GuardDuty takes an afternoon. Choosing the administrator account, covering every Region, routing findings to people and writing suppression rules that do not hide attacks is the real answer.

mediumNewPreparation tags: Amazon, Stripe, DatabricksUpdated Nov 2026

Enabling GuardDuty takes an afternoon. Choosing the administrator account, covering every Region, routing findings to people and writing suppression rules that do not hide attacks is the real answer.

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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

GuardDuty has been on for a month across 300 accounts. The SOC receives 900 findings a week, mostly port scans and SSH brute force, and an engineer proposes suppressing both finding types organisation-wide.

  1. What is wrong with suppressing both types everywhere?
  2. How do you cut the noise instead?
  3. How do you know tuning did not create a blind spot?
  4. How do you summarise rolling out GuardDuty across an organisation?

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