I applied through university. The process took 1 day. I interviewed at Jane Street (Boston, MA) in Nov 2015
Interview
Phone interview. Math questions with almost no help or guidance from interviewer. It was over the phone so very hard to use any feedback from interviewer. The problems contained a lot of nitty gritty calculations, so be prepared.
Interview questions [1]
Question 1
Various math and probability questions involving 20-sided dice, cards, or weighted coins. Two player games with dice and reward based on dice roll.
Maths probability questions in the first rounds getting harder and harder as you progress. If U have a basic understanding of the matter you should do fine in the first round but you might struggle later on
Interview questions [1]
Question 1
Usually about games and the expected value of them
4+ phone screens, lots of probability and market making games, little to no behavioral beyond why trading/why JS. long final round, very hard, many rounds, not sure if they re-interview.
Interview questions [1]
Question 1
make a market on a game involving randomness, use side bets
I applied online. The process took 1 day. I interviewed at Jane Street in Dec 2019
Interview
Was generally okay, went in too nervous and unsure of my answers and so ended up not getting the role. Stopped at the first phone screen. Guy was pretty nice, but wasn't a trader and only worked in HR.
Interview questions [1]
Question 1
Probability of the product of two die is a square number. Probability of x number of coins tossed, even number of heads. Probability of 99 coins with no information, last coin is a fair coin and the same question as above.