I worked at Investment Technology Group full-time (More than a year)
Everyone is friendly and willing to answer questions.
High turnover within Analytics department.
I applied through college or university. I interviewed at Investment Technology Group (New York, NY).
Applied through school's career portal. The HR made initial contact via email and set up the interview. The interview was with the team (department) that was hiring and it lasted over 2 hours in total. The whole team of 5 people came to talk to me. Two at a time and in the end the Head of the Department.
Nothing intimidating! Regular conversational tone. I was asked to explain a couple of information from my resume which I did.