CME Group Software Engineering Internship interview questions

Passed online coding assessment through glider.ai. Passed first round interview with an engineer at CME. I was asked to code up a solution to an "easy" leetcode problem. Failed final round interview. 2 hrs 15 min interview split into three parts. First part was simple behavioral screening with a recruiter. Second part I had to find a bug in some code. It was extremely easy to find. The second part of the interview also involved discussing taking home problem (medium leetcode). You had 1 hr to do the take home problem before the interview. The third part of the interview I was asked to design a "trading system".