I applied in-person. I interviewed at Jane Street (London, England) in Jan 2026
Interview
first is the math part, as some typical stochastic analysis question about martingale, bs model, and simple SDE solving. Second part is coding test, 2 python code problems with leed code hard level questions.
Interview questions [1]
Question 1
BS model, algorithm coding(leedcode-hard, palindrome problem) Given an integer x, return true if x is a palindrome, and false otherwise.
The process began with serveral online tests for maths and logic. They gave a personal interview to get to know the candidate better and evaluate fit for the company/role, then held a technical interview covering maths and logic problems.
Fun and filled with unexpected questions. The questions rely on fast thinking and fast calculations, and sometimes intuition because there is no sufficient time for me to work through the whole problem.
We started with a bit of small talk, followed by some probability questions. Ended with some basic algebra questions, Make sure to ask questions if you have any. Good experience, feels like the interviewer was trading.
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