I was called by HR. Interviewed by him and he asked me some questions about my previous experience and education etc. Then I was interviewed by tech. lead same day. After then HR called me to inform that there is a final interview with CEO. That interview was on skype as the CEO was on a tour out of the country.

Very relaxing and comfortable the team was good. there were other candidates there as well. On the same day there were 2-3 rounds of interviews, first HR then technical then COO.