I am interested in ML lately so i like and understand their current approach to solving problems with it. I think that they are leader in "AI race" at the moment seeing how DeepMind is evolving and how they use ML in their products and optimizing their own infrastructure with it. I think I could learn a lot there. I always liked challenges and solving interesting problems and in my opinion Google is a good place to do that. I am not mentioning things like scale etc because that is common in other companies also.