System Design · Meta · Medium
You are adding hashtag recommendations to posts in the main feed of a large social app. The goal is to increase meaningful engagement without damaging the overall health of the feed experience. Design the full system from problem definition through production rollout. Be concrete about trade-offs and justify your decisions. Problem framing. Define the exact prediction target $$Y$$ and the unit of observation—for example, a user–post–hashtag impression evaluated within 24…
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