Jane Street Quantitative Trader interview experience

This was my third round with the firm, and during the session the interviewer seemed disengaged and barely paid attention to my solution. The question itself was very game-like: I was dealing with a deck of cards and the setup required thinking about a winning strategy with specific counts of red and blue cards, essentially turning it into a multiplayer strategic game.

In another complete process, the structure looked more organized and varied. After early technical rounds that focused on problem-solving with probability and game theory themes, I went into an in-person day with multiple