Product design question
Given a mirror, a camera, and connectivity, make a product.
- Product design
- Hard
Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.
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What this question tests
Tests open-ended product design and creativity: synthesizing three loosely defined inputs into a specific user and real need.
How to approach it
- Brainstorm directions: a fitness-form mirror, a retail try-on mirror, or a telehealth check-in mirror.
- Pick one and justify it: a home fitness-form mirror giving real-time posture feedback during workouts.
- Identify the user: someone doing home workouts without a trainer, worried about unsafe form and injury.
- Design the core loop: the camera captures movement, a model compares it to reference form, the mirror gives feedback.
- Prioritize a narrow initial exercise set, like squats and deadlifts, to ensure accuracy before expanding.
- Define success as workout session completion rate and self-reported confidence or reduced soreness.
What a strong answer includes
- Picks one specific, well-justified product direction instead of listing several without committing.
- Grounds the concept in a real, common pain point, not a novelty gadget.
- Scopes the MVP narrowly to manage feasibility and accuracy.
Common mistakes
- Listing multiple product ideas without picking and developing one.
- No consideration of feasibility, which forms are actually detectable reliably.
Likely follow-up questions
- How would you validate the form-feedback accuracy before launch?
- How would you price and position this against gym or trainer costs?
- What would you build next after the initial exercise set?
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
More questions from Google
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