Your crash reporting shows a spike after a release, but only on some devices. How do you track it down?

What the interviewer is looking for

• This question tests mobile testing & crash monitoring. Uses unit and interface tests, device coverage, crash reporting and analytics to find and fix issues fast.
• Strong answers: Reading stack traces and breadcrumbs, grouping by device and operating system version, reproducing on that device, a hotfix or flag, and adding a test.
• Likely follow-up: How would you decide between halting the rollout and shipping a quick fix?

Another way it may be asked: After Tuesday's release, crashes went up on certain older phones. Walk me through finding the cause.

A structure to follow: Answer, explain, example, limits

1. Step 1

   Answer

   Give your direct answer in the first sentence so the interviewer knows where you are going.

2. Step 2

   Explain

   Say how it works or why you would do it that way, in plain words before jargon.

3. Step 3

   Example

   Anchor it in something you have actually done or seen, with the detail that shows hands-on experience.

4. Step 4

   Limits

   Say when your approach would not be the right one. It shows judgement.

This is guidance on shape, not a script. Use your own real experience and facts; never invent details to fill a gap. See the STAR guide and answer frameworks.

Common slips

• Reciting a definition without showing you have applied it.
• Using terms you cannot explain if asked a level deeper.
• Claiming experience beyond what you can discuss in detail.

How to practise it

Say the answer in 90 seconds, then answer the follow-up as if it were a new question.

Related questions

• Can you explain the lifecycle of a screen in an iOS or Android app, and why it matters when you load data?
• How do you make sure your app's screens adapt to different screen sizes, dark mode and larger text settings?
• Imagine a user opens your app on a subway with no signal. What should the app do, and how would you build that?
• How would you build a scrolling list of thousands of items so it stays smooth on an older phone?
• What architecture pattern do you use to structure your app's screens and logic, and why that one?

Browse all questions