Design systems can help teams move fast and create coherent products. On paper, they are the perfect state of productivity. In practice, they are difficult to get right. The efficiency of reusing resources and setting thoughtful constraints often clashes with creative requirements. In this talk, Nathanael Silverman will explore how Airbnb's Design Language System (DLS) is implemented on Android. Nathanael will also provide a look at component libraries, scaling, testing, and internal tools that Airbnb's Android engineers use every day.