The process took 1 day. I interviewed at Jane Street (New York, NY) in Sep 2010
Interview
I applied online. I was asked to be interviewed days later. The first questions are calculations such as 145x23. Later come 2 probability questions and two brainteasers. The interviewer is a male with no foreign accent. He sounds friendly and patient.
Interview questions [1]
Question 1
find a subset of {1,2,3,...,30} so that numbers in that subset is coprime to each other.
A phone call, about 40 mins long, there was no formalities only vet technical questions. Around about 4 questions, with extensions to them if you completed them quickly. You were expected to talk through your thought process and methods for solving these questions.
I applied through college or university. I interviewed at Jane Street
Interview
Zoom Interview with only audio. We had to think aloud while solving the questions. Questions were from estimation, probability and games. Lots of follow up questions were asked. It was difficult.
Interview questions [1]
Question 1
Compare games related to throwing dice, simulate m-sided die using n-sided die.
The process took 2 days. I interviewed at Jane Street (London, England) in Oct 2021
Interview
Hard, first interview wasn't so bad with some relatively basic probability questions, second interview was a massive step up contained much more difficult questions that took a longer period of time to answer