Two experiments overlap on the same surface — are they interfering?
Experiment designHardProblem. Two teams are running experiments on the Home feed at the same time — one changes ranking, one changes the thumbnail UI. A PM worries they'll contaminate each other. How does Google handle this, and when should you actually worry?
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.