Jane Street interview questions

First stage interview, pair programming with a senior for a problem related to his field. Complexity was added to the problem gradually. Great vibe and enjoyable chat, the task wasn't challenging per session, but it's much less clear what they wanted compared to other places.

The programming test was conducted on CoderPad using my preferred programming language. There were two interviewers present: a lead interviewer who guided the session and a second interviewer who observed and evaluated my performance. The main focus of the interview was not on syntax accuracy or whether the code could be executed perfectly on the spot, but rather on how to design structured, clean, and optimized solutions. Minor syntax mistakes or forgetting the exact name of a function were generally acceptable, as long as the intended functionality and approach were clearly explained.