Frontend Architecture and Client Side Performance Questions

Understand modern frontend architectures including component-based design, state management patterns (Redux, MobX, Context API), server-state management vs. client-state management, and performance considerations. At Staff Level, go beyond framework details. Understand: virtual DOM and how it impacts performance, optimization techniques like code splitting, lazy loading, and tree-shaking, client-side routing and its implications for performance, progressive enhancement, and how to design APIs that minimize client-side work. Be comfortable discussing accessibility, performance metrics (LCP, CLS, FID), and how frontend decisions impact backend requirements (e.g., pagination vs. infinite scroll affects data loading patterns).