Metrics question
The users of a mobile app complain that the app is slow. As a product manager, what will you do about it?
- Zillow
- Metrics
- Medium
Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.
Start a mock interview on this question · Mock interview from a job description
What this question tests
Whether you can turn a vague complaint into a measurable diagnosis and action plan.
How to approach it
- Clarify: define slow, is it app launch time, screen load, or search results lag, and on which devices.
- Instrument: pull performance metrics, like time to first render and API response times, segmented by device and OS.
- Prioritize by impact: find the specific screen or flow driving most complaints and affecting the most users.
- Diagnose root cause: check for bloated payloads, unoptimized images, or slow backend queries.
- Fix and validate: ship a targeted fix, then measure the metric improvement before declaring it resolved.
- Set an ongoing guardrail: a performance budget alert so regressions are caught before users complain again.
What a strong answer includes
- Moves past the vague complaint to a specific metric, like time to interactive over 4 seconds on the listing page (assumption).
- Segments by device, since older Android devices are often the real source of slowness complaints.
- Sets a performance budget as an ongoing guardrail, not a one-time fix.
Common mistakes
- Jumping to a fix before instrumenting to find the actual bottleneck.
- Treating all users as having the same experience, ignoring device or network segmentation.
- No mention of a guardrail to prevent regression.
Likely follow-up questions
- How would you prioritize a performance fix against a feature roadmap?
- What tools would you use to diagnose this on real user devices?
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- Utilization went down by 45% on app XYZ in Italy for the month of August. Give a reason why and draft a plan to fix it.Spotify · Metrics · Medium
- Define the metrics for YouTube search.Google · Metrics · Medium
More questions from Zillow
Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 9: Prove it paid off: outcomes, economics, and pricing
- Chapter 2: Data fluency: SQL, logs, and reading the truth yourself
- Chapter 14: Get the job: the AI PM interview loop