I applied through university. The process took 1 day. I interviewed at Jane Street (Chicago, IL) in Nov 2016
Interview
1 hour earlier phone call. The questions are all about the optimal bid for a bid problem. The interviewer cares more about the intuition about your result instead of the mathematical derivations. 3 more rounds may come around in the next few weeks. I think I have pretty well prepared, but I still got nervous mostly because this is my first time to do phone interview for intern/job.
Interview questions [1]
Question 1
Assume x dollar(uniformly from(0,1000)) is put into a blackbox. Then you bid on the amount. If x>bid, you get return 1.5x-bid; otherwies you get nothing. The question is what is the optimal bid. Several other different circumstances are also been asked.
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.