React is incredibly flexible, which is a double-edged sword. Without a strict architectural pattern, an enterprise React codebase can quickly turn into unmaintainable spaghetti code.

Essential Best Practices - Feature-Based Folder Structure: Organize files by feature (e.g., `features/auth/components`) rather than by type (`components/`, `hooks/`). - State Management: Use global state (Zustand, Redux) sparingly. Prefer server-state libraries like React Query or SWR for API fetching. - Strict Typing: TypeScript is non-negotiable for enterprise apps. It catches errors at compile-time and serves as living documentation.

Scalability isn't just about handling traffic; it's about how easily a team of 20 developers can work on the same codebase without breaking things.