The hiring and interview process is quite rigorous at Google. The first was an initial phone interview which was not too daunting, just covered general experience, achievements to note and gather my interest in the role. The second interview was quite intense. It was basically 2.5 hours of 1 case study to test problem solving, general IQ/mathematical questions, behavioural questions and questions around a real life work example to test if I could perform in the role. There was no break and the interview was conducted by 3 different employees.