I applied online. The process took 4 weeks. I interviewed at Riot Games (New York, NY) in Dec 2016
Interview
After applied online through Riot careers, I was selected for the first round. I interviewed on phone with the hiring manager of this role, who was also the lead data scientist of the team. The first interview turned out to be pure behavioral.
I applied online. The process took 3 weeks. I interviewed at Riot Games in Feb 2013
Interview
An initial phone screen, then a technical phone interview with some data science people. They asked about how to predict a binary outcome, went through two different ways of doing it (trees and logistic regression). They also asked about how you might approach a specific problem in their company. Asked about validation and training/test sets.
Very friendly HR representative, and the technical and behavioral interviewers were quite welcoming, too. I would've appreciated a non-automated rejection after the second phone interview. The interview itself was informal, and the technical question weren't too technical in nature. However,
the behavioral questions were quite tricky.