Jane Street Software Engineer interview experience

The Excel part was a screening-style task, but the main substance was in the later interviews.

In the math and logic round, I got a set of three questions: one about combinatorics involving a palindrome, and then a dice-roll probability scenario. The dice question was detailed: with three players, I had to compute win probability, and there was also a conditional restart twist if all players rolled the same numbers. I also had a coding problem based on trades where I needed to find the top three trades without using a helper function, with extra complexity around handling both long and short