The interviewer asked me some probability questions, felt kind of competition mathy. The interviewer was friendly but I got stuck on the math. It doesn't seem like it was meant to be too hard if you're familiar though.
Interview questions [1]
Question 1
They asked some probability questions, a little tricky if you don't have any familiarity
first there's a 10-15 min call with a recruiter (another form of screening i guess) where you talk about your background and experiences. then if you pass that, an online interview. if you pass it too, there are 3 on-site interviews (they pay for everything), 2 before lunch and one after.
I applied online. The process took 3 weeks. I interviewed at Jane Street (New York, NY) in Dec 2025
Interview
First round was a simple OOP question, building up in difficulty as you get previous parts right
Next round questions were more difficult but of the same nature with 2 engineers