No interview. They were mostly interested in verifying educational transcripts, legal employment status, and aptitude. If you can't pass the certification test, you can't be a rater. They pay you for the time you spend studying the test materials.

Turned in my resume online. Was emailed the next day to complete the process. After turning in some more forms online, I was officially hired, pending certification. After two days of online training, I passed the certification test and was ready to go. I did this in August, then just started this week early October.

There was essentially no interview for the position. I applied for the position (required cover letter included) and got a response about a month or two later via email. The company lets you know whether or not they have decided to offer you employment (not guaranteed until you formally send them your new employee information and pass their training). Passing training is difficult, but if you focus on the rubric and how the company would score the essays, it can be done!