J'ai postulé en ligne. Le processus a pris 1 jour. J'ai passé un entretien chez Jane Street en déc. 2013
Entretien
This is the first interview I had ever. The interview was very quantitative, although the questions are not difficult. Most of the questions are probability, for example, i was asked if two teams have the same probability of winning a game, then what is the probability they will compete the seventh game in a best 4 out of 7 games.
Questions d'entretien [1]
Question 1
A bus has some number of people initially. At first stop, three quarters of the passenger get off, and 7 get on the bus. At the second stop, the same thing happened, three quarters of the passenger get off, and 7 get on the bus. At the third stop, exactly the same thing happened as previous two stops. What is the minimum number of passengers to start with?
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