I went through 3 steps: phone call with HR, phone call with a manager of the team, interview on-site with three members of the team. All the questions during the interviews have been related to my experiences and to the Google product, no consulting style question. They have been always very kind, but the overall process lasted almost 4 months.

I applied online before Christmas and was first contacted in about 2 weeks after application. First i had a phone screening with the recruiter, who was very nice person. He asked about my CV, my experience and skills. Then i had another phone interview with someone from the team - this time it was more about the industry (marketing, AdWords...). Then in about a week i contacted the recruiter and he said ive done well and the want me to come to Dublin for another round of interviews. They took care of everything (flights, hotel) so i just flew to Dublin offices and had another 3 interviews with people from the team. I thought i did good, but they didnt make me an offer - although they said i can try again in about a year (should i gain more experience in leading people). Google wants leadership experience even if you dont apply for a job where you will be leading a team...Still it was very good experience and i recommend trying to get through this process.