J'ai passé un entretien chez Jane Street (New York, NY)
Entretien
Pretty simple interview process, I think there were probably 3 or 4 rounds total if you made it all the way. First round is basic probability questions, and I made quite a few mistakes but I think they give a lot of leeway. Second round is to play a game with a trader, and I think final round is after that but I didn't get there.
1st round--45 minute phone call purely technical with brainteasers. no behavorial besides brief introduction of self. i believe there are 2nd and 3rd round phone and a final superday but didn't make it past there.
multiple online interviews, technical in nature, followed by an in person in office interview which lasted an entire day and had multiple stations. focused on problem solving, probablity, game theory etc etc
J'ai postulé en ligne. Le processus a pris 1 semaine. J'ai passé un entretien chez Jane Street (Londres, Angleterre) en nov. 2025
Entretien
They started with a basic introductory question followed by some probability based stuff. Wasn’t too difficult but you have to ace it, they expect perfection. They cut the interview off at exactly 30 minutes, and will provide hints if you need it though it’s not a good sign if you need them.
Questions d'entretien [1]
Question 1
You have 20 cards. 1 is black the rest are red. You keep drawing cards and get $1 for each red, but if you draw the black the game ends and you get nothing. How do you play and what’s the average payout? Now drawing the black card makes your score go negative, but you can continue drawing cards. What’s the strategy and expected payout now?