Jane Street Quantitative Analyst interview: probability games before superday

I had several Zoom interviews, with three technical rounds before a superday. The questions were built around games presented by the interviewers and relied heavily on probability and game thinking. The early games were more straightforward and closer to deterministic setups. Later rounds brought more randomness and more game theory.

In the more open-ended game rounds, I needed to optimize outcomes such as profit or loss while tracking my own approach as the problems became harder. Hints were limited. If I got stuck, I still had to show the reasoning and keep track of the moving parts. Expected value and strategy under uncertainty were central.

I did not get an offer and my run ended before the final step. It did not feel random. The later rounds were testing whether I could reason through ambiguity, not just calculate quickly, and I felt the bar tighten as the games became more random and strategic.

Location: New York, NY. Overall feedback: positive. Offer status: no offer.