A telephonic interview round focused on Linux OS , basic networking and system troubleshooting questions. Overall easy. Got invite for face to face interview the following week. The in-person interview was 5 hours long including informal Lunch interview. Very detailed and thorough. Interviewers knew their stuff and kept taking notes as I answered questions. Small interview room with whiteboard and almost all questions required whiteboard answers. Had a headache by the time we were wrapping up in the evening. Overall was satisfied with interviews as answered most of the questions with optimal solutions. Got positive feedback following week that team was happy and got offer.