First few rounds are entirely mental math skills based (no writing notes)
Scheduled by HR person but interviews are by traders. Those traders might call a half hour to an hour later than the scheduled time.
The first round is 3 math questions followed by guessing on how correct the previous answers were.
Interview questions [1]
Question 1
Which question do you most thing you were wrong about and how wrong were you?
Initial application and online assessment. Had a first round behavioral interview where they asked me about myself, my experiences, and a couple of brain teasers. The interviewer was very nice.
Phone interviews (at least 3) - questions were of mixed difficulty (some pretty hard) but the interviewers were friendly and they gave helpful hints. Kind of fun - review probability and game-type questions.
I applied online. I interviewed at Jane Street (New York, NY)
Interview
I first applied in google form answer basic questions about me and with that I had to upload my resume and transcript. I don't remember after how long I got an interview time to choose and did my first round of interview.