Google

Extensive, multiple phone call and video call interview rounds. Not too bad, but the process seemed to lack a sense of direction. Poor communication from HR during the process. Overall, an average experience.

The phone interview was not too technical and focused more on my background and manufacturing consulting projects I have led. Onsite was rigorous. I met with several senior people, including the hiring manager. Feedback from the recruiter was that

This was a hard interview. First, there was a technical interview, which involved pseudo-code on a Google Docs sheet. Then, there was an in-person interview in Mountain View, which consisted of four (or possibly five, I can't remember) interviews.