System Design · Meta · Hard
Requirements Functional behavior: build a notification inbox for every user that receives items from multiple origins, including social activity, advertisements, product updates, and system messages. Determine both the ranking order and whether each item should be sent or withheld. Each potential notification includes: its source category, recency, estimated CTR, advertiser value when relevant, and the user's current fatigue level. Processing flow: run retrievers tailored to…
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