I applied online. The process took 1 week. I interviewed at Jane Street
Interview
Email from HR to schedule phone interview. Phone interview with QR from Jane Street a few days later. Overall the interview was very difficult, but the researcher was very friendly and helped through the process when I was stuck. Some difficult probability questions. Questions like these are easy once you see them, but difficult when you first try them. I'd recommend getting exposure to as many questions as possible.
Interview questions [3]
Question 1
Given deck of cards A and deck of cards B, which deck would you rather choose from if you need to choose two cards of the same color on consecutive draws? Deck A is a normal 52 card deck, Deck B is a 26 card deck with 50% black and 50% red. What if we add deck C, which is a 26 card deck that comes from a random subset of deck A?
You play rock, paper, scissors with an opponent, but your opponent cannot play rock. What should you play to maximize your expected profit if every time you win you win $1, lose you lose $1, draw you win $0?
Play rock, paper, scissors again and again your opponent cannot throw rock. The game ends when one person loses. You play another round if there is a draw. What is your strategy?
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.