I applied through college or university. The process took 1 week. I interviewed at Jane Street
Interview
Very smart individuals -- very quantitative. They are interested in how you think as opposed to whether you get the right answers (although getting the questions right doesn't hurt). You should totally practice probability questions as much as you can in order to prepare. It turns out that you don't need to be a genius to be good at probability questions or brain teasers -- you just need a lot of practice.
Interview questions [1]
Question 1
You have two bowling balls of the same density. One has a radius of 8 and a weight of 16; the other has a radius of 12. What is its weight?
Many rounds of brainteasers, some of which are more rapid fire in nature and others which require you to flesh out a detailed answer to a complex problem. Be well rested and well prepared!
mostly maths probability questions - a lot of conditional probability, relatively easy in the first round, but you need to think out loud - you need to be really fast
4 rounds in final. The first one is market making of cards. The rest are especially designed games. The interviewer may ask added question along the playing of the game