Jane Street Capital Trader Interview Questions & Reviews

Interview Details – Applied through school and got an interview within a week.

Interview Details – Probability questions
15000*500
.02 of that

4 coins, I flip them, give you dollar for each heads. How would you pay to play?
What if I give you the option to reflip any coin?
What if I make you reflip?

Interview Details – I got through four phone interviews before I was taken out of the running. One thing that was annoying was that interviewers would constantly cancel on me, but HR was very good about rescheduling them. Interviews consist of a TON of mental math and brain teaser questions. You really have to be on top of your game for every interview.

Interview Details – I was contacted by the recruiter the next day after my application. The recruiter asked for some sample code from some recent projects. After I submitted the code for a couple of projects I had worked on, I was contacted for the first (phone)) interview. The response were very fast. My interviewer was very polite and seemed very smart.

Interview Details – Mental math and probability questions

Interview Details – Interviewer was very friendly. Helped me work through problems I was stuck on. Told me I could take as much time as I needed to answer the questions. Cannot use pen and paper. Interview consisted of four mental math questions and then some probability questions. Afterwards I was allotted some time to ask questions about the firm.

Interview Details – There were 3 phone interviews. No questions about self or goals or anything like that. All the questions were involving math or problem solving. The first interview was a few mental math questions followed by 4-5 relatively simple brain teasers. The next two interviews both only consisted of 2 brain teasers and a confidence interval question that you have to explain.

Interview Details – Very interesting interview experience. The trader I talked to was also a graduate of my university, and very laid-back. Very strong and loyal culture, but it sounds like an extremely intense environment. The interview consisted of like 5 minutes "fit," but it wasn't forced at all, mostly conversation. The rest of the interview was straight-up quantitative brainteasers and probability. Took me forever to multiple 27 times 37.. be prepared with your mental math for sure.

Interview Details – It's all been said before. Started with 3 phone interviews, first was a lot of mental math, then mostly probability questions, with a bunch of different math brain teasers thrown in. The first one is easy (seemed to be mostly to weed out people who look good on paper but can't back it up), but they get harder. Completely doable--make sure to brush up on your mental math, and be ready to think out loud.

The day-long interview on site was much harder, mostly due to nerves, but also because of the length of the interview. They don't care about your social graces, just play to win. You will need to be able to approximate your confidence in your answers and wager accordingly. Admittedly, I had an off-day and looked like a fool. I have nothing but respect for the firm though, they were actually exceptionally professional (yes, their dress code is non-existent, but they have their reasons).