[tehlike]

It actually works quite nicely. Most of the google software is built internally. Ensuring everyone is running at head is a blessing (rarely a curse), because when you make a change you immediately see if it breaks something. You can also be sure everything gets all the bug fixes in their new release. This is good for various reasons, including the fact that it makes security audits significantly simpler.

Some google orgs, like android, don't use the existing infra, and they kind of struggle and have to reinvent most wheels, because of that.

Edit: added second paragraph