I applied online. I interviewed at Roblox (San Mateo, CA) in May 2017
Interview
The interview had 4 parts: an online coding test, an on-site with the team, a phone chat with VP and a Google Hangout with the CEO. Everyone was very friendly, technical questions were not hard, just reasonably difficult. The process took about 4 weeks.
Interview questions [1]
Question 1
Online coding: given an array of positive and negative numbers, return a maximum possible product of 3 numbers.
Took an OA. Pretty difficult leetcode style questions and some games (Roblox games and psychology based games to determine personality traits). I did not get through the initial online assessment.
One standard hr phone call then one 60 min phone screen. Nothing out of the ordinary. Phone screen was done on codesignal where you could see code compile and run
Interview consisted of two leetcode style questions and two "games" that tested problem solving and optimization. Coding questions were of medium/hard difficulty. The games were difficult as the instructions given were terrible and unintuitive.