I applied online. The process took 1 day. I interviewed at Jane Street in Oct 2017
Interview
In my first phone interview I was asked one challenging probability question spanned the whole interview. The interview was very attentive and offered minimal but helpful guidance. It seems like they mostly want to understand how you think and solve problems.
Interview questions [1]
Question 1
I was asked to compute the expected value of a card game using pen and paper.
The process began with serveral online tests for maths and logic. They gave a personal interview to get to know the candidate better and evaluate fit for the company/role, then held a technical interview covering maths and logic problems.
Fun and filled with unexpected questions. The questions rely on fast thinking and fast calculations, and sometimes intuition because there is no sufficient time for me to work through the whole problem.
We started with a bit of small talk, followed by some probability questions. Ended with some basic algebra questions, Make sure to ask questions if you have any. Good experience, feels like the interviewer was trading.