A customer's step-up rate doubled overnight, but fraud reports are flat. What happened?

Diagnose a problemMedium

Problem. A neobank that uses Protect at signup usually steps up about 5% of new users. Yesterday it was 10%, and today looks the same. The customer's fraud team says they haven't seen more fraud reports. They're asking us what's going on. How do you figure it out?

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.

Design the backtest that shows a prospect what Protect would have caught →