So far, the process has been an informal chat with a technical sourcer/recruiter at Google, followed by a technical phone screen with an engineer.
The recruiter will give you a bunch of resources and links. You should look through them and truly know them.
I was asked for:
The following metrics were computed from 748 interview experiences for the Google Software Engineer role in Mountain View, California.
Google's interview process for their Software Engineer roles in Mountain View, California is very selective, failing most engineers who go through it.
Candidates reported having very good feelings for Google's Software Engineer interview process in Mountain View, California.