What would be the best way ? Traveling to Zurich/London for interview may not be possible
Between Google's different offices, is there a difference in interview levels ? Eg: are interviews at Zurich harder than interviews at Dublin ?
Read about interview loop. Hiring is consistent among all offices, otherwise you would see all people interviewing at some location.
Internal transfer.
That's roundabout and lengthy process I guess . Will probably have to stay in US for a yr before trying right ?
For google it’s too easy if you have good perf reviews. It’s merely a project transfer.