Define success for a new recommendation model
Measure successMediumProblem. A team built a new Home recommendation model. Before the launch, they ask you: how should we define and measure whether it's a success?
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.
Interview tips
Strong-answer signal: treating offline wins as a screen, judging success on a live valued-watch-time A/B with a satisfaction guardrail, and reading the days-in curve for novelty. Common trap: shipping on an offline win, or reporting the week-1 peak lift and ignoring decay and the satisfaction guardrail.