Interview started with tech person, they offered some coffee. Advanced questions about latest graphics tech, non trivial problem solving questions, algorithms. After technical questions there were generic personality questions mostly related to HR.

Applied through a friend. Was asked about programming experience in OpenGL and artificial intelligence. Was given a phone interview several days later, discussed resume and graphics settings; what I use in games I play, and what I'd use in an ideal setup. In person interview consisted of more personality questions, a graphics themed 'spot the differences' quiz, an example of how to submit a bug report, and finally a couple sessions of Heroes of the Storm. HR seemed disorganized, occasionally only sending me new information after a reminder email, even getting the time of my in person interview wrong due to timezone differences.