I would design a component library using a modular and reusable architecture, focusing on scalability and maintainability. First, I would adopt a design system to ensure consistency across different projects. The components would be built using TypeScript to ensure type safety, especially in a large-scale codebase like Binance's. Each component would be isolated and independent, built with extensibility in mind. I would ensure proper theming and customization options using something like CSS-in-JS or a utility-first CSS framework like Tailwind CSS. Moreover, I’d set up Storybook for documentation and testing, so developers can easily visualize components in isolation and see how they behave with different props. For scalability, I'd also implement tree-shaking to allow importing only the necessary components, reducing the final bundle size. I would use tools like lerna for managing multiple packages within the monorepo, ensuring smooth version control and package publishing.