I applied for a specific group and received two phone interviews. Both interviews focused on specific questions related to the team. One interview focused on general knowledge about the team's background, while the other was to design an algorithm. The interviewers were both very experienced and helpful in answering my questions.
Specific algorithm design for computer vision related problems.
The following metrics were computed from 4 interview experiences for the Google Hardware role in United States.
Google's interview process for their Hardware roles in the United States is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having very good feelings for Google's Hardware interview process in United States.