The interview process was quite unique and my overall experience is positive. For other candidates I can recommend to hardly learn linux kernel internals. This process gave me princeless feedback how to improve my knowledge and this is a huge advantage. Feedback was given within 10 minutes after the interview.

1.5hr of conversation-based interview. Questions about your past experience, stuff you do at work and home. A few fairly easy (for every Linux/Unix geek) technical questions about Linux, shell scripting, cloud computing, networking, common technologies and databases. Around 30 minutes of whiteboard architecture talk - this aims to prove you are able to work around a specific problem, propose a solution and implementation, generally speaking guys are trying to know "are we able to do stuff together".