Grokking the AI System Design Interview
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Design Feed Ranking

Frame the Problem: The Funnel Transfers

Questions such as "design Instagram's feed" or "design LinkedIn's feed" use many of the recommendation concepts from the previous lesson.

You already have the shape from the recommendation funnel. A stage pulls candidates, a ranker scores hundreds of them, and a rule layer sits on top.

Briefly explain the shared architecture, then focus on the requirements that differ for a social feed.

Focus on three important differences.

  1. The candidate pool is social

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