Building a design system in React is about more than just a component library; it is about creating a single source of truth for your UI logic and visual identity. As the creator of CoreUI, I’ve architected dozens of design systems that power enterprise-level applications. The most efficient approach involves using design tokens for constants, the React Context API for theming, and a component-driven architecture to ensure modularity. By following these principles, you can create a robust system that improves both developer velocity and design consistency across your organization.