Why Google Stores Billions of Lines of Code in a Single Repository

EARLY GOOGLE EMPLOYEES decided to work with a shared codebase managed through a centralized source control system. This approach has served Google well for more than 16 years, and today the vast majority of Google’s software assets continues to be stored in a single, shared repository. Meanwhile, the number of Google software developers has steadily increased, and the size of the Google codebase has grown exponentially (see Figure 1). As a result, the technology used to host the codebase has also evolved significantly.

https://dl.acm.org/doi/pdf/10.1145/2854146

very detailed document. Loved it

Great document. Google has great inbuilt tools. They have been having inhouse ChatGPT like AI tool for long.