They used a website called hired for technical assessment. Possibly the worst site I've seen, for a simple SQL assessment it had so many bugs. The question was simple but the site made it 10x more difficult - you can't tell whether a mysql function is supported or not even though it may have been around for years.

3 stages: screening, coding test, system design interview. The hiring manager was quite supportive but I was supposed to have a prep talk before system design interview right before which the hiring manager got sick and cancelled. Well, I guess it was on me for not moving and for being unprepared.