Only done first interview so far but invited to second round. Very positive experience overall. Interviewer made me feel at ease. Felt more like a discussion/collaborative work than just a test.
Interview questions [1]
Question 1
Questions about cupcakes to do with finding the optimal strategy. More about estimating probabilities and using logical reasoning rather than finding exact answers using formulae.
1st round--45 minute phone call purely technical with brainteasers. no behavorial besides brief introduction of self. i believe there are 2nd and 3rd round phone and a final superday but didn't make it past there.
multiple online interviews, technical in nature, followed by an in person in office interview which lasted an entire day and had multiple stations. focused on problem solving, probablity, game theory etc etc
I applied online. The process took 1 week. I interviewed at Jane Street (London, England) in Nov 2025
Interview
They started with a basic introductory question followed by some probability based stuff. Wasn’t too difficult but you have to ace it, they expect perfection. They cut the interview off at exactly 30 minutes, and will provide hints if you need it though it’s not a good sign if you need them.
Interview questions [1]
Question 1
You have 20 cards. 1 is black the rest are red. You keep drawing cards and get $1 for each red, but if you draw the black the game ends and you get nothing. How do you play and what’s the average payout? Now drawing the black card makes your score go negative, but you can continue drawing cards. What’s the strategy and expected payout now?
Quantitative Trading Intern applicants have rated the interview process at Jane Street with 3.8 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 73% positive. To compare, the company-average is 63.8% positive. This is according to Glassdoor user ratings.
Candidates applying for Quantitative Trading Intern roles take an average of 18 days to get hired, when considering 37 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 Quantitative Trading Intern according to 37 Glassdoor interviews include:
Phone interview: 30%
One on one interview: 23%
Skills test: 14%
Presentation: 11%
IQ intelligence test: 9%
Personality test: 9%
Other: 5%
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