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Interview question · Security Foundations & Threat Modeling

Apply data minimisation and purpose limitation to a feature that sends user data to a model provider.

Privacy principles become engineering decisions about fields, retention and contracts. The scored answer walks one feature and makes each principle concrete.

mediumNewPreparation tags: Apple, Google, MicrosoftUpdated Nov 2026

Privacy principles become engineering decisions about fields, retention and contracts. The scored answer walks one feature and makes each principle concrete.

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 6 follow-ups like an interviewer would

A product team is building a feature that analyses users' messages to suggest replies, using a hosted model.

  1. What is purpose limitation here?
  2. What does minimisation mean?
  3. What about the model provider?
  4. What about retention and logs?
  5. What about transparency and control?
  6. How would you engineer privacy into the feature?

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 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?Next in this trackTell me about a time you pushed back on a product team for security reasons.
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