I applied through a recruiter. The process took 6 days. I interviewed at Roblox (San Mateo, CA) in Nov 2016
Interview
The stages of their hiring process is pretty much standard but it was very well organized and fast with their great recruiting staff. At onsite interview with their engineers, they will give you tough programming quiz, so be prepared. Stay calm and work it out.
Interview questions [1]
Question 1
Programming questions (C/C++): String search algorithm using predefined word array