I applied through college or university. The process took 2 weeks. I interviewed at Jane Street in Feb 2014
Interview
Interview process was relatively smooth, interviewer called right on time. After a one sentence intro, he got directly into mental math questions. Besides that, he also asked some probability questions and my confidence in each answer. All in all, not incredibly hard, but definitely not easy. Very much unlike interviews for other companies.
Interview questions [1]
Question 1
Two dice - one 12 sided one 6 sided. Guess the roll of the two dice, no penalty for guessing under. You receive the amount on the dice if you guess it. What is the expected value? What is the bet that would maximize your payout?
I applied through college or university. I interviewed at Jane Street
Interview
Applied through campus recruiting, and had interview on campus. Told me how the interview was going to work: technical questions, no behavioral questions. Very casual; wore khakis and a flannel. After a couple of probability questions, he let me go and told me I would get an email about the second round of interviews
Interview questions [1]
Question 1
Expected value of various binomial distributions, game theory
I applied online. I interviewed at Jane Street in Oct 2014
Interview
I applied online and got the phone interview invitation within a few days. The online application is the simplest I've ever seen. I applied to both London and Hong Kong office and the interview is from London office. A trader interviewed me.
Interview questions [1]
Question 1
The interview is not very hard. But I made mistakes in very basic questions. It starts with calculating the sum of odd numbers within 100.
I applied through college or university. I interviewed at Jane Street
Interview
Applied through Career Fair. Offered phone interview shortly after.
Interview questions [1]
Question 1
The interview started and I was told to not use and pencil or paper. They asked me some squaring questions and some subtraction with large numbers. I was also asked how much I would pay to play a game where I get heads if I win a dollar, and how much I would be willing to pay if I was able to re-flip up to two more times.