How do you design React component architecture and state management for a medium-sized app to balance reusability, performance, and developer productivity? Give concrete examples of patterns, libraries, and trade-offs you chose.

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VirtualInterview.AI · Accepted Answer

At my last role on a 6-person frontend team building an internal analytics app for ~10k users, I split responsibilities between presentational and container components, using a feature-folder layout so teams own vertical slices. For state I used Redux Toolkit for global state (auth, user prefs) and React Query for server state — that cut boilerplate by ~30% and reduced perceived load time by 25%. I created small, documented UI primitives (Button, Modal, Table) with TypeScript and Storybook, which sped new feature dev by ~40%. For performance I memoized heavy lists with virtualization (react-window) and used suspense-lite patterns for data loading. Trade-offs: more upfront infra and dev discipline, but we gained faster delivery and fewer regressions.

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