I work for Google and do come into HN occasionally. See my profile and my comments here. I'd come more often if it were easier to know when there's something Google Search-related happening. There's no good "monitor HN for X terms" thing I've found. But I do try to check, and sometimes people ping me.

In addition, if you want an explanation of how Google works, we have an entire web site for that: https://www.google.com/search/howsearchworks/