Anyone Changes Everything

Every person executes sweeping changes across the whole codebase. And they won't break things, even though they have never seen most of the code they are changing.

The company has an effective monorepo. People and teams are able to safely make changes anywhere in the repo. Tools support those changes, as do good remodeling and refactoring techniques. Key techniques: branch by abstraction, refactor by script, distributed test execution of local changes.