senior-frontend

Build modern, performant frontend UIs: component design, state management, rendering performance, and accessibility. Covers React and Next.js (web) plus React Native, with framework-specific mechanics in reference files; the judgment applies cross-framework. Use whenever the user builds or optimizes UI components, manages client or server state, or fixes frontend performance including list virtualization and scroll or render jank (e.g. FlatList). Do NOT use for visual or aesthetic design direction (use frontend-design), or for animation and gesture craft (use motion-craft).