Product design question
How would you make Youtube faster?
- Product design
- Medium
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 product and technical judgment on a performance problem, identifying which 'faster' matters most and how to prioritize it.
How to approach it
- Clarify what 'faster' means: video start latency, buffering, or app load time, since causes and fixes differ.
- Identify the highest-impact target: video start time, the moment users most directly feel and abandon on.
- Diagnose likely causes: network conditions, bitrate ladder choice, or CDN edge distance from the user.
- Prioritize a fix: smarter adaptive bitrate selection starting lower, then stepping up after assessing the connection.
- Consider which users are worst affected, slow mobile networks or distant regions, to prioritize the fix.
- Define success as reduced median and p90 video start time, correlated with watch-time improvements.
What a strong answer includes
- Narrows 'faster' to a specific, measurable moment, start latency, instead of a vague overall speed goal.
- Proposes a concrete technical lever grounded in how video streaming actually works.
- Segments by likely worst-affected users to prioritize where the fix matters most.
Common mistakes
- Giving a vague answer like 'optimize the app' with no specific target or mechanism.
- Ignoring which user segment is most affected and would benefit most.
Likely follow-up questions
- How would you measure the trade-off between start speed and initial video quality?
- How would this differ for users on slow connections versus fast ones?
- What would you do if faster start times didn't improve watch time?
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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