Jane Street’s process was fast and intense: OA with puzzles, technical screen on algorithms and systems, then three onsite rounds (math, coding, infra). Interviewers were sharp, emphasizing clear reasoning and precision.
Questions d'entretien [1]
Question 1
Design a real-time system to process millions of trades per second—how would you ensure low latency, fault tolerance, and exactly-once processing?
They tend to examine the logical thinkers that can communicate clearly and concisely, and some problem-solving exercises intended to explore how you gather and apply new information, very different from other tech companies' interviews.
Initial application and online assessment. Had a first round behavioral interview where they asked me about myself, my experiences, and a couple of brain teasers. The interviewer was very nice.
J'ai passé un entretien chez Jane Street (Londres, Angleterre)
Entretien
Phone interviews (at least 3) - questions were of mixed difficulty (some pretty hard) but the interviewers were friendly and they gave helpful hints. Kind of fun - review probability and game-type questions.