Submitted my CV online, received an email to schedule a phone interview call. The interview lasted around 25 minutes, and I answered 3-4 questions in total. I wish I had looked at interview questions beforehand on Glassdoor, because many of the problems turned out to be posted on this site.
Multiple rounds of probability questions (and some combinatorics) of increasing difficulty. One of the easier examples: what's the probability you've rolled 2 6s (after rolling 2 d6s) given that you've rolled a 6?
Interview questions [1]
Question 1
I interviewed in autumn 2021. Fairly standard probability questions. I didn't prepare, so I flunked the second round. See Mosteller's Fifty Challenging Problems in Probability with Solutions (you should be able to find a PDF online) for practice. My first-round interviewer was quite pleasant. However, my second-round interviewer arrived over five minutes late to the interviewer, sighed quite loudly when I was slower than he wanted and was overall quite rude. I was shocked by the lack of professionalism, and I even wish I had challenged him on it at the time. The interviewers can be quite poor at communicating (you can see this even in the example interview Jane Street have posted to their own website!) so make sure the question is completely clear to you before attempting to answer; don't assume anything. Lastly, if you come from a mathematical background, it'll often be tempting to try to find an exact solution. Jane Street isn't looking for this (again, see the example interview on their site). Focus on getting to a relatively quick answer that doesn't have to be too precise.
I applied online. The process took 6 days. I interviewed at Jane Street (London, England) in Sep 2022
Interview
A lot of mathematical problem solving and brain teaser type questions mainly involving everyday things such as a deck of cards or dice. You can solve using general probability and statistic concepts as well using some general knowledge on how you would expect something to turn out.
I applied and was invited to interview afterwards. From what I have read online, the interview seems to have been of a format similar to what is standard for a trading internship at such a company.
Trading Internship applicants have rated the interview process at Jane Street with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 33% positive. To compare, the company-average is 63.8% positive. This is according to Glassdoor user ratings.
Candidates applying for Trading Internship roles take an average of 7 days to get hired, when considering 4 user submitted interviews for this role. To compare, the hiring process at Jane Street overall takes an average of 17 days.
Common stages of the interview process at Jane Street as a Trading Internship according to 4 Glassdoor interviews include:
Phone interview: 33%
One on one interview: 33%
Presentation: 17%
Skills test: 17%
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