Grokking the AI System Design Interview
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Design Feed Ranking
Frame the Problem: The Funnel Transfers
"Design Instagram's feed" or "design LinkedIn's feed" sounds like a brand-new problem. It is not.
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.
Do not rebuild that from scratch. Say out loud that it transfers, then spend your time on what a social feed changes.
Here is what changes, and it is only three things.
- The candidate pool is social
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