Avoid these mistakes that hurt candidates:
Starting code too early: Design first, implementation details later.
Ignoring requirements: Don't assume. Ask clarifying questions.
Single-track thinking: Cover breadth before depth. Touch all RADIO phases.
Framework obsession: Don't argue React vs Vue. Focus on architecture patterns that work anywhere.
Forgetting the user: Frontend design is about user experience. Mention loading states, error handling, and edge cases.