Product design question
How would you design a recommendation engine page for Myntra (fashion e-commerce) for its Product Detail Page for a newly onboarded customer?
- Cars24
- Product design
- Hard
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What this question tests
Cold-start recommendation design: solving personalization for a user with no purchase history, a common hard product design problem.
How to approach it
- Identify the challenge explicitly: a newly onboarded customer has no purchase history, so standard collaborative filtering recommendations will be poor or empty.
- Identify available signals despite the cold start: the specific product page they are viewing, any onboarding style quiz answers, device type, and broad demographic or location signals.
- Design the recommendation logic: lean heavily on item-to-item similarity (visually and category similar products to the one being viewed) rather than user history based collaborative filtering.
- Add a lightweight signal capture: a quick style or size preference prompt at signup that seeds early personalization without requiring purchase history.
- Prioritize item similarity and the style quiz over pure popularity-based fallback, since popularity alone ignores the user's actual expressed interest on this page.
- Define success as click-through rate on recommended items for new customers, benchmarked against the recommendation performance for returning customers.
What a strong answer includes
- Names the cold-start problem explicitly and correctly reasons that user-history based collaborative filtering will not work for this segment.
- Proposes item-to-item similarity as the practical fallback, a standard, well grounded technique for cold-start recommendation problems.
- Benchmarks new customer recommendation performance against returning customers, giving a clear, fair way to judge success despite the harder starting conditions.
Common mistakes
- Proposing a recommendation approach that implicitly assumes purchase history exists, ignoring the stated cold-start constraint.
- Falling back only to generic bestsellers, which ignores the specific product context the new customer is actually viewing.
Likely follow-up questions
- How would recommendations improve as this customer accumulates more browsing and purchase history?
- How would you balance a style quiz's added signup friction against its personalization benefit?
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Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 4: Discovery and strategy for AI products
- Chapter 7: AI UX and human oversight: design for a system that is wrong sometimes
- Chapter 14: Get the job: the AI PM interview loop