The new ranker: GMV +7.5%, watch +3%. Ship it?
Launch or notHardProblem. The team migrated feed ranking from batch to online inference. The buyer-randomized A/B shows For You Feed GMV +7.5%, orders +5.2%, watches over 1 minute +3.0%, watches over 10 minutes +3.7%. Everything is up. Ship it?
Before you reveal: say your answer out loud, as if you were in the real interview — get your reasoning across clearly first. There is no single correct answer: reading what the interviewer is really after and defending your own thinking is what makes an answer strong.