Jane Street Software Engineer interview experience

Once I solved it, the interviewer immediately pushed with follow-ups—extensions of the same idea—so the test wasn’t just whether I could finish, but whether I could keep adapting the solution.

Across the conversation, they focused heavily on correctness and on runtime awareness. I was expected to be sensible with time and not just produce something that technically works on paper; they wanted code I could run and then test, and there were moments where they asked me to cover multiple functions or iterate on the approach. When I got stuck, the interview felt respectful and collaborative, with