I applied online. The process took 4 weeks. I interviewed at Two Sigma (New York, NY) in Sep 2017
Interview
They asked pretty straight forward questions through hacker rank, either you know it or you don't. If you've taken the data structures class, you should understand how it works. Just read the programming interview book and you should be set by that point
2 out of the 3 interviewers were very helpful. They genuinely want you to pass. It is just LeetCode. Practise the Medium ones and a little bit of System Designs.
Received the OA in January and received first round technical invite after a few weeks, LC medium/easy for the OA online 60 minute hacker rank. Then 3 60 minute technical interviews.
I applied online. I interviewed at Two Sigma (New York, NY)
Interview
2 technical rounds followed by 1 behavioral.
1st technical: 1 interview (45-60 min long).
2nd technical: 2 back-to-back interviews.
Behavioral: 3 back-to-back interviews.
Technical interviews were all Leetcode style.
All interviews were conducted by engineers or engineering managers.
Interview questions [1]
Question 1
Describe how you resolved a conflict with your manager.