The Datadog team built a design system called DRUIDS, which is used across the platform to ensure a unified and efficient user experience. The system includes features such as quick navigation, contextual documentation, editable playgrounds for developers and designers, auto-generated API tables, and contribution guidelines to facilitate collaboration and evolution of the design system. To make it easy for users to understand and implement DRUIDS, the team has implemented tools like a command line wizard that generates scaffolding for new components, and made the documentation site public at druids.datadoghq.com. The goal is to make DRUIDS not just a design system but a living, breathing part of the Datadog platform that users can trust and contribute to.