Design System Component Library
Build a reusable component library with Button, Input, Select, Modal, Toast, DataTable, and Form components — fully typed, accessible, and documented.
Overview
Create a production-grade component library like Shadcn/UI. Each component is fully typed with TypeScript, follows WAI-ARIA accessibility guidelines, supports theming (light/dark), and is documented in Storybook with interactive examples.
Design systems are the foundation of scalable frontend development. Companies like Shopify (Polaris), Adobe (Spectrum), and GitHub (Primer) invest heavily in component libraries because they enforce consistency, reduce duplicate code, and encode accessibility best practices that individual developers might otherwise overlook. Building your own teaches you the patterns that power these production systems.
The engineering depth comes from designing APIs that other developers will use. Every prop decision matters: should the Button variant be a string union or an enum? Should the Modal use compound components or a single component with many props? Should the Select support render props for custom option rendering? These API design decisions determine how ergonomic, composable, and maintainable the library will be.
For senior frontend interviews, component library design is a core competency. Interviewers frequently ask candidates to design a component API on the spot, discuss accessibility patterns for complex widgets, and critique existing libraries. Having built one yourself gives you authoritative answers grounded in implementation experience.
Interview questions
- What components should I build?
- How do I make components accessible?
- How should the component API be designed?
- How do I set up Storybook?
- How do I implement the toast notification system?
- How do I implement theming with CSS variables?
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