La procedura ha richiesto un giorno. Ho sostenuto un colloquio presso Jane Street nel mese di set 2011
Colloquio
mental math and a brain teaser. face-to-face interview. 30 min in total. casual dress is fine. interviewer wears t-shirt.
Domande di colloquio [1]
Domanda 1
brainteaser: 30 people are 15 couples. they shake hands, but two people of the same couple don't shake hands with each other. now you know 29 people shake hands with different numbers of people (e.g. one person shakes hands with 4 others, another person shakes hands with 5 people, etc). question: how many people did the 30th person shake hands with?
Ho sostenuto un colloquio presso Jane Street (Londra, Inghilterra)
Colloquio
Digital interview through zoom, one probability question and one (hard) brainteaser, 45 min, barely anything behavioral. I don't know how to prepare for the brainteaser well but the probability one could be practiced for.
Domande di colloquio [1]
Domanda 1
Dice game with 100-sided die, play against an opponent and the one who gets the higher number wins 1€ from the casino (not from the other person). Tie = no money. You get the option to double the number of your roll for 0.2€. In what interval is it worth doubling?
Ho sostenuto un colloquio presso Jane Street (New York, NY)
Colloquio
The process was overall quite smooth. It included several technical rounds focused on probability, statistics, and logical reasoning, along with some classic brainteasers. I realized I wasn't well enough prepared for the probability questions, which made it more challenging.
Domande di colloquio [1]
Domanda 1
You are playing a one-player game with two opaque boxes. At each turn, you can choose to either "place" or "take". "Place" places
$
1
$1 from a third party into one box randomly. "Take" empties out one box randomly and that money is yours. This game consists of
100
100 turns where you must either place or take. Assuming optimal play, what is the expected payoff of this game? Note that you do not know how much money you have taken until the end of the game.
Three interviews all including maths, probability (cards, dice etc). Quite hard, need to talk through answers with interviewer while doing the questions and they will help you get the the answer if stuck
