I applied online. The process took 3 weeks. I interviewed at Jane Street (London, England) in Nov 2022
Interview
3 rounds of 1h high complexity live coding with 2 SDE interviewers, no compilation, any programming language is ok. All rounds happen on the same day with short breaks in between.
Interview questions [1]
Question 1
Design and optimize structure for 1D Excel like operations of set_cell_value(int, cell), sum_of_cells(cell_1, cell_2, result_cell). All data must be correct and updated after each call of refresh().
it was nice. He was very kind and talkative. he explained the problem quite clearly. It was good experience. Will apply again definitely. Jane street is very good. You guys shud apply too
Fast and efficient, everyone is friendly.
The interview was fully techinical, no background or behavioral questions for me. The style is very collaborative — asking for hint in a proper way would be considered a plus I guess.
First round was online, one round of 1hr class design questions.
Given a class interface, you need to implement it with another given class interface. My question is like a general tree question.
You kinda need to go far enough to get to next round, so if you're too slow or have trouble solving easier parts, you cannot make it. I didn't move on.