2 remote technical interviews (skype, audio only). One with team lead. It was quite difficult, but bearable. Second with SDET 2. It was quite easy.
1 technical interview in office, airplane tickets was paid. Interview was very hard, as for me. 2 hours of continuous questions regarding my technical knowledge and personal qualities.
1 stress interview with technical director. It was the worst one. After that I thought I will never get an offer. I was ready for stress testing, but not in my field of knowledge.
1 formal interview with HR specialist. Pure pleasure.