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Interview question · Mobile Application Security

In an authorised mobile assessment, what can you test and observe on an unrooted, locked device, and what can you not?

Most mobile findings do not need root at all. The ones that do usually point to the same conclusion: the server must not trust the client.

mediumEssentialNewPreparation tags: Google, Apple, MicrosoftUpdated Nov 2026

Most mobile findings do not need root at all. The ones that do usually point to the same conclusion: the server must not trust the client.

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

You are given a production banking app on a locked, unrooted phone and three days for an authorised assessment.

  1. What can you do without any device?
  2. What dynamic testing works on an unrooted device?
  3. How do you test the API?
  4. What can you not test well?
  5. How would you spend the three days?
  6. How would you run the assessment?

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.

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