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Propose and Validate a Mobile App Improvement

Last updated: May 14, 2026

Quick Overview

This question evaluates product design and system-design skills for mobile applications, including product thinking, high-level implementation planning, experimentation design, and metrics-driven decision-making within the system design category.

  • medium
  • Whatnot
  • System Design
  • Software Engineer

Propose and Validate a Mobile App Improvement

Company: Whatnot

Role: Software Engineer

Category: System Design

Difficulty: medium

Interview Round: Technical Screen

Assume you are working on a consumer mobile app. Propose one product improvement that could improve user engagement, retention, or conversion. Your answer should cover: - What user problem you are solving. - Which user segment is affected. - The feature or product change you would build. - How you would implement it at a high level. - What success metrics you would use. - How you would design an A/B test or experiment to verify impact. - What guardrail metrics you would monitor. - Whether the change could negatively affect other users or parts of the product.

Quick Answer: This question evaluates product design and system-design skills for mobile applications, including product thinking, high-level implementation planning, experimentation design, and metrics-driven decision-making within the system design category.

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Whatnot logo
Whatnot
Jan 24, 2026, 12:00 AM
Software Engineer
Technical Screen
System Design
0
0

Assume you are working on a consumer mobile app. Propose one product improvement that could improve user engagement, retention, or conversion.

Your answer should cover:

  • What user problem you are solving.
  • Which user segment is affected.
  • The feature or product change you would build.
  • How you would implement it at a high level.
  • What success metrics you would use.
  • How you would design an A/B test or experiment to verify impact.
  • What guardrail metrics you would monitor.
  • Whether the change could negatively affect other users or parts of the product.

Solution

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