Optiver Linux Administrative interview questions

the initial contact came from Linkedin, then I have a phone interview with two people from the Linux team. It was short and less technical. Then got invited to onsite half-day interview. Meet three members of the Linux team, including their team lead. Conversation flowed easily, they are prepared and asked mid to advanced level of Linux related questions. A lot question and quizzes on bash or python scripting (you choose). Generally they came as well rounded group of Linux geeks with fair amount of expertise.