I applied online. The process took 1 day. I interviewed at Jane Street in Sept 2011
Interview
Hardest interview of my life. Know your probability and mental math or you would be exposed. The interview consisted of two parts. The first was the mental math section where I was asked to compute four different math problems mentally. The interviewer then ass how much you are willing to wager on the outcome. The next part is then the probability section. There are also 5 interviews and this was Interview 1 so it would get progressively harder
Interview questions [1]
Question 1
If you roll a 10 sided die and you roll a 20 sided die, what is the probability that you get a bigger roll on the 10 sided die?
I interviewed at Jane Street (London, England) in Jan 2026
Interview
einen runden spiele am Vormittag und dann programmieren am nachmittag.
Biem spiele hat man parallel wetten sollen, also ein buy and sell zwishudn ein sechseiiger Würfel und sowas. oder karten wetten auf das die karte rot ist und zwischen 5-9 was zahlst du für diesen output und so. anrfang rechnen danach abschärtzen udn Ergebnisse interpretieren
Overall, it was a pleasant interview experience. I answered a few personal questions and encountered one that was slightly confusing, but the interviewer was friendly, and the conversation flowed well overall
Probability questions, nothing crazy but quite open ended, they want to know your thought process and calculations. Pen and paper allowed but no calculator. No OA, a few rounds and got rejected. Zoom call with a trader.