Design Video Recommendations · System Design Interview

Design Video RecommendationsDesign what fills a video site’s home page: for everyone who opens it, a personalised row of videos chosen from hundreds of millions, in the time it takes the page to load.What it has to do

The home page shows a personalised list of videos to each signed-in viewer

A newly uploaded video can be recommended within an hour

What a viewer watches, skips or finishes changes what they are shown by their next visit

Scale

Daily active viewers: 500 million

Videos that can be recommended: 800 million

Out of scope

Ads

The internals of the model beyond what the system needs from it

Content moderation

Video delivery and playback

Practise this challengeAll system design challenges

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