J'ai passé un entretien chez Jane Street en août 2015
Entretien
Getting the interview was really easy. I did not even give a cover letter. I got an email 3 days later and organised the interview one week later. The interviewer was perfectly on time. She was really nice and patient with me even though I blew the interview. Questions were easy, but I blew it because of stress and my mental calculations were not on point.
Questions d'entretien [1]
Question 1
1.5 chicken lay 1.5 eggs in 1.5 days. How many eggs do 9 chicken lay in 9 days?
The process was structured and intellectually challenging. It typically involves an initial recruiter screen, followed by probability, mental math, expected value, and game-style problem-solving interviews. Interviewers focus more on reasoning, communication, and adapting to feedback than memorized answers.
Questions d'entretien [1]
Question 1
You have two opaque boxes in front of you. At each turn, you may choose one of two actions:
Place: put one coin into one of the two boxes, chosen uniformly at random.
Take: choose one of the two boxes uniformly at random, take all the coins inside, and empty that box.
You play for exactly 100 turns. Your goal is to maximize the expected number of coins you collect.
What is your optimal strategy?
J'ai passé un entretien chez Jane Street (Hong Kong)
Entretien
Several phone calls to go to the final round. The phone calls consists of mathematical, probabilistic brain teasers which was not that hard for a mathematics major. Final round was to harsh for me, strong mentality is required
J'ai postulé en ligne. Le processus a pris 4 semaines. J'ai passé un entretien chez Jane Street (New York, NY) en avr. 2026
Entretien
Lots of expectation/probability questions. Make sure to study game-theory type question that involves expectations. Specific concepts in stochastic processes don't seem that important. The first two were relatively easy. Just make sure to ask a question if there is any uncertainty