Trading Strat Analyst

I applied via school career fair, and was informed one week before interview that they want to fly me on-site. There was a total of 9 rounds of interview. 5 groups interviewed me in the morning, during which they will decide the candidates they want to interview for a second time. Then in the afternoon, those that no group is interested in were called to leave, and candidates left are asked to do final rounds with interested groups. The interview each lasted about half an hr, consisted of mostly probability and algorithm question. Surprisingly the algorithms part is harder than many tech companies.