Process took about 2 weeks, first a phone call with a really nice dude, all behavioral questions, and questions about a projects. My next call interview was with 3 of his colleagues, a mechanical engineer, an electrical engineer, and finally the CEO. At first the mechanical engineer seem to rush the interview, and only asked behavioral questions and questions about my projects. The electrical engineer asked almost the same questions, but he was the only one I found to be very friendly and I enjoy talking to. The CEO on the other hand was the worst of all, rushed the whole interview process, seem like he just wanted the call to end since the beginning, and provided no valuable feedback, but destructive criticism.