Jane Street Quantitative Trader interview experience

I was paired with two traders, and the questions were split between a probability game and something that required a simple algorithmic approach.

The probability portion was challenging in a way that exposed gaps in how I was setting up the reasoning. I stumbled through the answer and needed the interviewers to step in with support. The algorithm question added another layer, and I felt like I was chasing clarity rather than building a clean solution flow.

I didn’t move on to the second round. The process left me with the sense that even with partial progress, they wanted answers to be