Citadel Securities Software Engineer(Internship) interview questions

First round is behavioral and technical and second round is superday. Then is final round and team matching. Superday was virtual and 45 min each, all same format, with beginning behavioral questions, a huge chunk on system design, and final questions at the end.

First had a leetcode style test online. This was a couple of questions of around medium difficulty. I was then invited for an interview, where I had to transform some finance-related data into CSV using Pandas.