When companies look to Hire Frontend Developers at a senior level, the interview process needs to go far beyond asking someone to build a to-do list in React or explain what a virtual DOM is. Senior engineers are expected to own entire feature domains, make architectural decisions that affect teams for years, and write code that is maintainable, testable, and scalable. Why React Knowledge Alone Is Not Enough React is a library, not a measure of engineering quality. A developer can memorize every hook and still produce unmaintainable code. Questions like "What is the difference between useMemo and useCallback?" tell you nothing about whether the candidate knows when to reach for either or when the real problem is architectural. The most critical senior skills include designing component hierarchies that scale, isolating business logic from rendering concerns, writing deterministic and testable code, and communicating tradeoffs clearly. None of these are React-specific.…