I applied online. The process took 3 weeks. I interviewed at Jane Street (London, England) in Dec 2018
Interview
Receive email. Confirm the time for call. Phone interviewing the questions. The process is very quick and efficient. The interviewing questions are very hard. What's more, the interviewer seems to be very strict.
Interview questions [1]
Question 1
1.Self introduction
2.Basic stats problem.
3.Very hard questions that need to think quick.
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.