Design a switchback — how long should the windows be?
Experiment designHardProblem. You're running a switchback to test a delivery-pricing change. You must choose the region granularity and the switch interval (window length). What are the trade-offs, and how do you decide?
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.