1000 programmers on a single codebase means: • "master" always builds • "master" is always stable Any testing has to be done with in-code branches, and has t

1000 programmers on a single codebase means: • "master" always builds • "master" is always stable Any testing has to be done with in-code branches, and has to be built in-place incrementally so that other developers can see you touching stuff (and can be defensive about their tasks).