Heap's initiative to integrate a component library into its web app aims to streamline development and enhance consistency across its growing engineering teams. This effort emerged as multiple teams began handling front-end tasks, necessitating a uniform approach to component design and implementation. By collaborating with the Design team, which spearheads the visual aspects through a UI kit in Figma, a 1:1 correspondence between UI elements and library components is being pursued. The library's creation involves establishing contribution guidelines focused on code isolation, comprehensive examples, robust documentation, and stringent testing, all facilitated through tools like Storybook and Chromatic. Initial challenges included selecting components that met isolation criteria, leading to the migration of simpler components like RadioButton before tackling more complex ones. Achieving cross-team buy-in was vital, accomplished by involving all engineering teams in guideline reviews, cross-team code reviews, and shared responsibilities in moving components to the library. The project has led to a functional component library with a live Storybook, and ongoing efforts include refactoring existing components and adding new ones during project planning, fostering a more cohesive design system that supports Heap’s analytics platform.