One phone interview that was behavioral and asking why I was looking into Prometheus Group and what they did. The second and final interview was supposed to be a teleconference, but they rescheduled to go in. They went over my experience and asked pretty in-depth questions (why did I choose this technology, what did I think of this stack, etc.), some conceptual questions, then did whiteboarding for about 30 minutes. There was minimal interaction during whiteboarding, which made it very clear they wanted to see what I wanted to do without anybody to bounce ideas off of. They did help me when I wrote an (obvious) error in my pseudocode.