Google has publically described their build system here http://google-engtools.blogspot.com/2011/08/build-in-cloud-how-build-system-works.html http://google-eng

Google has publically described their build system here http://google-engtools.blogspot.com/2011/08/build-in-cloud-how-build-system-works.html http://google-engtools.blogspot.com/2011/08/build-in-cloud-h... (low fidelity) and here https://www.youtube.com/watch?v=2qv3fcXW1mg https://www.youtube.com/watch?v=2qv3fcXW1mg (high fidelity)