J'ai postulé via un établissement d'enseignement supérieur ou universitaire. Le processus a pris 2 semaines. J'ai passé un entretien chez Jane Street (Londres, Angleterre) en sept. 2023
Entretien
2 Mathematical questions, the first one is quite trivial, with a fair follow up. The second question resembles some familiar questions of lower cardinals (i.e. the version taking 3 red balls and 4 blue balls, from Jane Street traders reviews last year)
Questions d'entretien [1]
Question 1
There are 52 cards, black and red, each colour with 26 cards. Now you are taking cards indefinitely, for each red card you lose 1 point, for each black card you gain 1 point. To maximise your total points, what's your strategy?
J'ai postulé en ligne. J'ai passé un entretien chez Jane Street
Entretien
The interviewer was very informative. The questions appeared basic initially, but they required deeper reasoning, strong fundamental knowledge, and careful problem-solving instead of simple, straightforward answers throughout the interview process.
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