System Design · Meta · Hard
Requirements Functional objective: Deliver every user a personalized stream of short videos, with engagement measured through watch-time, completion, and sharing. Four-stage scaffold (the complete pipeline should be on the whiteboard from the beginning): Retrieval / candidate generation: Use a Two-Tower model or approximate nearest-neighbor search over embeddings, combining collaborative and content-based signals. Pre-rank: Apply a lightweight DCN-V2 or DLRM model to reduce…
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