Google builds a lot more of its own infrastructure than other companies can afford to do, all the way down to the hardware. They also change things more often internally than you will see with public-facing API's.

What I'm wondering, though, is about why headcount continues to expand. Besides the new buildings in Mountain View and NYC there's a whole new campus planned in San Jose, so there are apparently no plans to slow down. Where does it end?

https://medium.com/gabor/timeline-employee-count-growth-for-...