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Design a news feed ranking system (social media timeline).

Feed ranking is multi-objective ML at massive scale with a brutal serving constraint. The interviewer wants to see whether you optimize a value model toward long-term satisfaction, or fall into the CTR trap that breeds clickbait. Here is the design.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Feed ranking is multi-objective ML at massive scale with a brutal serving constraint. The interviewer wants to see whether you optimize a value model toward long-term satisfaction, or fall into the CTR trap that breeds clickbait. Here is the design.

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