Grid Dynamics Software Developer interview questions

I was contacted by a recruiter over the Skype. She said one of their employees recommended me. We had an appointment. I arrived to the office, had a quick talk (less then hour) with the recruiter and director of Kharkov office. Salary was discussed during this conversation. Then I got a laptop, was left alone in the office and got called by Skype. I was interviewed by colleagues from Saratov and Moscow, there were 3 or 4 people who were asking questions, listening answers and making short notes. 2 days later I received offer adn accepted it.