Product design question
Design an online store to sell Bicycles to 12 year old girls.
- Product design
- Medium
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What this question tests
Product design for a specific demographic segment, requiring the candidate to understand both the end user (a child) and the actual buyer (a parent).
How to approach it
- Identify the two distinct stakeholders: the 12-year-old end user, who cares about style, fun, and social status among peers, and the parent, the actual buyer, who cares about safety and value.
- Name concrete pain points for each: girls this age often can't find bikes that feel personalized or stylish rather than generic, while parents worry about safety features and sizing/fit for a growing child.
- Propose a focused design: a customizable storefront letting the girl pick color and accessory options, paired with clear safety certifications and a fit-by-height guide prominently shown to the parent.
- Address trust signals for the parent-as-buyer: reviews from other parents, safety certifications, and an easy return/exchange policy given kids grow quickly.
- Define success as completed-purchase rate and post-purchase satisfaction from both the child (via a simple feedback prompt) and the parent.
What a strong answer includes
- Explicitly separates the end user from the buyer, a common and important distinction in kids' product design.
- Names concrete, age-appropriate motivators for the child, personalization and social status, not generic 'fun' language.
- Addresses parent trust signals directly, since the parent controls the actual purchase decision.
Common mistakes
- Designing only for the child's preferences and ignoring the parent, who is the one actually completing the purchase.
- Treating '12 year old girls' as a single undifferentiated segment with no attention to safety or sizing concerns specific to a growing child.
Likely follow-up questions
- How would you handle the fact that kids this age outgrow bikes quickly?
- How would you market this without feeling like it's targeting children directly for a purchase decision?
More product design questions
- Design a TV for a car.Google · Product design · Hard
- Design a refrigerator for the blind.Google · Product design · Hard
- How do you design a camera for the elderly?Google · Product design · Medium
- Redesign Twitter for eCommerce.Shopify · Product design · Hard
- How would you go about designing a new location sharing app for Google?Google · Product design · Medium
- How would you improve Google Home?Google · Product design · Easy
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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