I registered on their website. When they want to hire people, they ask if you are interested in applying. Then, I had two rounds of interviews on campus. They may ask you to write code on a piece of paper or using a Google Doc. The interviews were very nice. They guided me to the correct answer and were very professional.
All the questions are easy at first. But they may ask you to step into it further and further. The most common questions are:
"Now you have this answer, how can we improve it?"
The following metrics were computed from 3,728 interview experiences for the Google Software Engineer role in United States.
Google's interview process for their Software Engineer roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Google's Software Engineer interview process in United States.