I applied through college or university. The process took 3 weeks. I interviewed at Two Sigma in Sep 2015
Interview
There was an online coding challenge followed by two rounds of phone interviews. The first phone rounds was theoretical questions and the second round was more of coding. The initial coding round was powered by Hacker Rank and had to solve 2 questions in about 3 hours of time. The questions were fairly simple and based on BFS and general data structures.
Interview questions [1]
Question 1
Data Structures and algorithms based questions. There were some theoritical networking related questions as well.
first interview was 60 minutes long with a leetcode hard question. second interview was 2 back to back 60 minute leetcode hard with emphasis on data structures. each interview had a 5 minute introduction and 10 minute at the end to ask questions
Standard medium difficulty hackerrank. The question involved decoded an encoded string. It was not something I had seen on LeetCode before and I think was unique to the company. The question was not that difficult but I ran out of time right before I could finish answering.
Interview questions [1]
Question 1
Decode a string encoded using a specific encoding algorithm.
It started of with one phone screen, then if you pass you have 2 back to back technicals, then 3 1 hour behaviorals, hiring committee, and management committee. Standard Leetcode and behavioral questions.