J'ai postulé en ligne. J'ai passé un entretien chez Jane Street
Entretien
After submitting my resume online, a date for a first round interview was set up. The interviewer called on time. The questions were focused on probabilities and problem-solving. The first interview is without pen and paper and it is expected that you come up with a solution within reasonable time, but you can take a few seconds to think. The interviewer was friendly, but didn't provide any help or hints if I didn't know the answer immediately.
Questions d'entretien [2]
Question 1
There are two painters: Mr. Fast can paint a room in 1h, Mr. Slow needs 1h15 min. If they work together, how long does it take to paint one room?
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