I applied through an employee referral. The process took 3 months. I interviewed at Two Sigma (New York, NY) in Dec 2019
Interview
3+ months, 10+ interviews in total.
Applied on-line then referral in parallel.
I had a few phone interviews then on-site with 8 back-to-back interviews across HR, Eng, Modeling, and Products across all levels.
Very professional, friendly and smart group of people.
The HR recruiter was incredibly thoughtful throughout the process.