I applied online. The process took 2 days. I interviewed at UserTesting in Nov 2014
Interview
Potential employees apply online using just your Email and a password. A couple hours later they sent me a video tutorial on how to test websites and how to use the recorder. Immediately after the training I took a recorded "test" where I reviewed a website for them and uploaded the video to be reviewed. Then they got back with me the next day to say it was accepted.