I applied through college or university. The process took 3 weeks. I interviewed at Jane Street (New York, NY) in Oct 2018
Interview
First round involves handling data using excel formula. Second round is a phone interview discussing mental math problem as other shared. Third round is a easy VBA question. I was rejected in this round, kind of weird. I am pretty sure the algorithm I used is the least time-consuming to handle this type of question.
Interview questions [1]
Question 1
Prob of at lease 2 coins heads up when throwing 3 fair coins
2 round online interviews. first round is leetcode, 2nd round is online 1to1 zoom interview, asked me brain teaser questions only, did not discuss cv. i f up on quite easy questions. shame on me.
I applied through a recruiter. I interviewed at Jane Street (London, England) in Feb 2026
Interview
Applied through a referral. The first step was an initial HackerRank-style assessment that was pretty straightforward and mostly Excel/data-analysis type work. I had to look up values, calculate metrics like profit, and answer practical business/math questions.
The second round was with a TDOE and was much more intense. It focused on live problem solving, analytical reasoning, and probability/math concepts. I would recommend being comfortable with expected value, expected wait times, conditional probability, basic optimization, and explaining tradeoffs clearly. The interviewer cared a lot about how I broke down the problem, not just the final answer.
Interview questions [1]
Question 1
One question involved expected wait times for a train that runs every 10 minutes, compared with walking. The train took 5 minutes and walking took 10 minutes. The interviewer kept adding new factors and asked whether the expected wait time or overall travel time would increase or decrease, and why. It was very interactive.
I applied through a recruiter. I interviewed at Jane Street in Dec 2025
Interview
Only did the mathematical problem solving interview. No advanced technical knowledge required. Focused mainly on creativity within arithmetic and statistics questions. Focus more on showing your thought process than just solving the question since the interviewer is happy to help if needed.
Interview questions [1]
Question 1
A train arrives at the station every 20 minutes. If you take 5 minutes to run and 10 minutes to walk, what is the expected wait time at the station?