I've interviewed with Google a couple of times for PM type roles over the last few years. I found the interviews pleasant enough, a few brain teasers hidden as algorithm questions and some very basic experiential questions...that sort of thing.
I had the distinct feeling that the outcome of the hiring process really had nothing to do with the interview so long as I answered competently enough.
One interview I nailed, got to the second round phone interview nailed it and then didn't get a call back...ever.
Out of curiosity I send some emails off, turns out the recruiter had quit or "was no longer with the company" or whatever and they had filled the position, please feel free to apply again.
Regardless, it didn't really matter, I had a good time, it was fun, I didn't get the job, but meh. I didn't have to go through the hassle of relocating either.
The few other SV type company interviews I've been on have been similar. Not terribly hard, a few brain teasers, lots of vocalized processing of my thinking process, but even with the ones I got an offer for, came away with the distinct impression that the interview particulars just didn't matter all that much. They were simply confirming some predisposed hiring assumptions and would probably go with whoever went to the best school or whatever arbitrary metric they were using.
They were looking for X, using a hiring process that looks for Y, and it all ended before a committee that hired for Z anyways.
I think this is the most important factoid that's come out of this all is this realization that Google finally had after crunching years worth of data (which was already common knowledge among the rest of the world):
"G.P.A.'s are worthless as a criteria for hiring, and test scores are worthless. ... We found that they don’t predict anything."
Well, they do predict that people who are given near term ranking and validation of their work will work their asses off to get that ranking and validation.
A little etymology: valedictorian, from valediction, from Latin valere
validate from Latin validus (see valid) from valere
So it's no wonder that valedictorian and validate have the same root. A high achiever is by definition somebody who's efforts have been validated against the measure of achievement (whatever that measure might be) and confirmed to be valere "well", "strong".
It's too bad that what a company needs is an employee that does their job, not one that needs to be constantly validated in their efforts.
And thus a hiring system, put together by validators, who designed the hiring system to validate and filter for people who focus on validation, forgot to look for people who get shit done and don't need to be thanked for it.
And as a result, Youtube becomes more and more unusable every single day.