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Interview question · Mobile Application Security

How do security fixes reach Android and iOS devices, and how should a banking app handle users on old OS patch levels or old app versions?

Your app can be fully patched on a phone whose kernel is two years old. The answer separates what you control, what the platform controls, and what you can only measure.

mediumNewPreparation tags: Google, Apple, JPMorgan ChaseUpdated Nov 2026

Your app can be fully patched on a phone whose kernel is two years old. The answer separates what you control, what the platform controls, and what you can only measure.

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

A bank's Android app is used on thousands of device models. A kernel privilege-escalation bug is being exploited in the wild; it is fixed in this month's bulletin, but most of your users' devices have not received the update.

  1. Why can't you just tell users to update?
  2. How do you know a device's patch level?
  3. What do you change in the app while devices catch up?
  4. What standing policy would you set?

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 hardware memory tagging (Arm MTE, Apple's Memory Integrity Enforcement), and which phone attacks does it actually stop?Next in this trackHow do MDM, work profiles and app protection policies secure company data on phones, and what can the company see on a personal phone?Next in this trackHow would you harden the phones of executives and journalists who may be targets of mercenary spyware?
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