Product design question
Design Whatsapp for children.
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What this question tests
Product design balancing safety, parental control, and simplicity for a messaging product aimed at children.
How to approach it
- Clarify age range and the core need: safe communication with a pre-approved list of contacts, mainly family and close friends.
- Identify pain points: parents worry about unknown contacts and inappropriate content, kids want simple, fun ways to chat.
- Prioritize safety controls over feature richness, since parental trust is the entry barrier for any kids messaging product.
- Propose a linked parent account that approves all contacts, with no ability for the child to add unknown numbers.
- Add content moderation for media shared, filtering flagged image or video content automatically before delivery.
- Define success as parent adoption and approval rate, with zero tolerance guardrails for unmoderated content reaching children.
What a strong answer includes
- Puts parental contact approval and content moderation first, correctly treating them as prerequisites, not add ons.
- Designs a genuinely linked account model, not a standalone child account with unrestricted contact addition.
- Gives an illustrative feature, e.g. assumes auto filtering media using a moderation API before it reaches the child's device.
- States a strict guardrail, zero tolerance for unmoderated content, reflecting the seriousness of the trust bar for this audience.
Common mistakes
- Designing fun features first while treating safety controls as secondary.
- Allowing children to add unknown contacts without parental approval.
- No content moderation for media shared between approved contacts.
Likely follow-up questions
- How would you handle a contact request from someone not on the approved list?
- What would your content moderation approach look like technically?
- How would you balance parental control with age appropriate independence?
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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