Phone screening followed by a take-home exam. The screening consisted of typical HR questions: why are you interested in working for Trello, how did you hear about us, etc. The interviewer asked if I had any plans on moving, to which I replied that I had no plans to--it being a remote position. He then volunteered that one is only able to accept a position with Trello by residing in one of 38 states (not including my current residence). Note that this was mentioned on neither Trello's job board nor the description. At this point, I had to back track and state I was willing to move (went over so very well), and inquired which states one is able to work from--the interviewer did not have that information. He sent that information a couple of days later. The next step was a take-home exam.
I heard nothing for a week, followed up via e-mail, and waited another week only to get the response of "You'll be hearing from this person soon." Two more weeks later, another person shares the ground rules of the take-home exam. They send you the questions a day ahead, so you can clarify any issues. The day of, you have three hours to answer these questions.
One of the questions was a simple do-you-know-SQL. Two were open-ended questions, one of which used Trello-specific jargon. The fourth was a open-ended analysis question. Here's a large amount of (yet again) Trello-specific data, which you will have to spend an half an hour familiarizing yourself with before even considering any remotely productive questions.
See if you can find anything.
One could very easily have spent the full three hours on this last question alone.
Two weeks later, I received the terse thanks-no-thanks e-mail.