Have you had failures in your experience? If yes, what kind?

Yes, in my experience, there were mistakes that became valuable lessons:

• Incorrect state management — in one project, I initially used local state in components, which led to difficulties in synchronizing data between them. I solved this by implementing a centralized state manager (Redux).

• Lack of error handling — in early versions of the application, I did not handle API errors, which caused users to see blank screens without explanations. After adding error handling and notifications, the UX significantly improved.

• Component overload with logic — I wrote overly large React components, which made maintenance difficult. Later, I started breaking them into smaller, reusable parts.

Each of these mistakes helped me better understand frontend architecture and the importance of good practices.