How do I approach System Design interview questions?

System Design questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master system design interviews.

What difficulty level is this interview question?

This is a medium difficulty System Design question, commonly asked during Technical Screen rounds at Whatnot.

What role is this question designed for?

This question is commonly asked for Machine Learning Engineer candidates at Whatnot during technical interviews.

Improve and debug the shopping app | Whatnot Interview Question

Improve and debug the shopping app

Last updated: Mar 29, 2026

Quick Overview

This question evaluates product-minded engineering competencies including product intuition, user-experience assessment, telemetry-driven diagnostics, funnel and segmentation analysis, and debugging/observability skills relevant to a machine learning engineer.

Whatnot

Jan 17, 2026, 12:00 AM

Machine Learning Engineer

Technical Screen

System Design

44 solved

You are evaluating a live-shopping mobile app from a product-minded engineering perspective.

Answer the following as one integrated exercise:

What do you think of the app experience, and what improvements would you suggest?
How would you identify product categories that are underperforming?
Suppose the team believes there is a bug affecting category performance or user experience. How would you debug it?

Your answer should explain how you would combine direct hands-on use of the app, product intuition, metrics, dashboards, logs, funnels, segmentation, and hypothesis-driven investigation.

Solution

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