RejectedOnsite

Sample-Size Math in the Experimentation Round

RobinhoodData Scientist · Onsite · Oct 2025

I've been getting rejected a lot in interviews lately. Today I got another rejection — they said my performance in the experimentation round wasn't good. I felt like I did really well in that round; I covered all the concepts I'd prepared ahead of time. I honestly don't see what was bad about it. For the experimentation round, they asked about the benefits of launching fractional shares and how t…

Shared by a candidate · reported Oct 2025. Interview formats change; use it as a guide, not a script.