Started by submitting my resume, was first contacted by a California based recruiter to set up an initial phone interview. Really basic 20 minutes, going over my resume, basic experience, why do you want to work at Google. Was asked to do a second phone interview which was more in depth. About 40 minutes with questions that basically made you outline how you would go about doing different tasks. Not much you can prepare for this part, just picking apart your decision making process. Was finally asked to an on person interview which consisted of multiple people. Short interviews, very friendly, straight to the point kind of things. Supposedly there is one last interview after this point but I was unfortunately not invited to the next round. It was a very mentally and emotionally draining process. It was a lot of work to just be turned down in the end.