After reviewing my application, someone from HR called me to ask a few basic questions about my experience and my motivation to work for Google. Afterwards, I was invited to a first interview in Zurich which was about "Googleyness and Leadership". Shortly after that, I was invited to Dublin for two further interviews about "General Cognitive Ability" and "Role related knowledge". 2 days later, I was informed that they will not progress with my application.
The people from HR are very friendly, helpful and quick in answering emails. You also get your feedback within a few days after the interview.