I applied online. The process took 2 weeks. I interviewed at Optiver (Chicago, IL) in Nov 2016
Interview
Phone screen followed by a hackerrank test. After passing both I was invited to the onsite.
Had the interview 4 rounds of interview with the team. Everyone was really nice! The recruiter did a great job setting up hotel and flights. Overall I really had a great time at the office and left with a positive experience.
Interview questions [1]
Question 1
Typical Computer Science fundamentals and design question that I stumbled on.