J'ai postulé en ligne. Le processus a pris 3 mois. J'ai passé un entretien chez Jane Street (New York, NY)
Entretien
There were three rounds of phone interviews, each one longer than the last; mine went from 20 minutes to 45 minutes to 60 minutes. After this, I was invited to their office for a final round of interviews. There were three interviews of one hour each, along with lunch with one of their traders and a tour of the office.
For the on-site interviews, they give you a stack of poker chips, then present you with games of chance (of various complexity) and ask you to place bets on the outcomes. Then they actually roll the dice, deal cards, etc. and pay you if you win.
I should note that they were upfront about their reticence to hire people that hadn't already had internships with them. True to form, they didn't hire me.
Questions d'entretien [1]
Question 1
Specific interview questions are confidential; I will only note that they were probability problems and some basic game theory. No fancy math, though some problems did require a trick as the straightforward approach would take way too long.
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