Jane Street Software Engineer (internship) interview questions

Phone interview. Jumped straight into technical question about a simplified mock trading system. Live coding. Interviewer seemed distracted and could hear talking in the background. I felt like he was not really listening.

Used online collaborative text pad tool to produce solution to problem. Some communication problems, but by and large, all interactions with company were prompt and pleasant. Highly technical interview, so would recommend revising the basics of 1) operating system fundamentals (inodes and sh*t), standard algorithms and data structures (won't get asked to write a hash table, but you better know how to), and more general technical topics. Interviewer allowed me to choose the language I wrote in; do not expect to be forced to write OCaml