Yes, always. It is company policy. Google takes its standardized interview process more seriously than any other company I've heard of, except maybe Palantir.
I don't know, someone would have to ask Vint. But it is a plain fact that Google interviews the engineers of a potential acquisition. For a small company, they'll pick and choose which ones to keep. For a large company, I don't know. The CEO may or may not go through the full interview process -- I've seen it both ways, seems to depend on whether they're buddies with the VP.
