Design Watch History and Resume · System Design Interview

Design Watch History and ResumeDesign how a streaming service remembers what each profile watched and how far into it they got, so any of their devices carries on from there.What it has to do

Resume a title from where it was left off, on any device

Show the "continue watching" row, and leave out what has been finished

A profile can remove one item, or all of them

Scale

Profiles: 500 million

Position updates per second at peak: 2 million

Continue-watching reads per day: 3 billion

Out of scope

Recommendations

Playing the video itself

Billing

Analytics for the content team

Practise this challengeAll system design challenges

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