System Design · Pinterest · Medium
Requirements Create a leaderboard system that accepts a category and produces its highest-ranked K posts (or pins or users), ordered by a score such as clicks or engagement. Cover the following points: An API for retrieving the top K entries within a category. Live score changes consumed from a click or engagement event stream. Deterministic handling of equal scores and repeatable result ordering. Operation at a scale of millions of categories. Time-based and historical…
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