At Microsoft, I work on a very large TypeScript-based git repository where over 300 developers build and write code for high-value frontend components which are used across all Microsoft365 products. It contains about 150 npm packages, containing over a million lines of TypeScript code. Co-locating these components encourages collaboration and sharing code across teams much easier. In this talk, we’ll focus on the tooling used and code organization to make the development easier, faster and more reliable, with a major focus on the largest pain point of package management and orchestrating common tasks across the packages.