What difficult and interesting problems have you solved? Tell about an interesting or complex feature.

One of the interesting tasks I encountered in frontend development was implementing a dynamic dashboard with many widgets that users could customize: change size, order, and content. The main challenge was to ensure smooth dragging and resizing without losing performance, while also preserving the state between sessions.

For this, I used a drag-and-drop library but added my own logic for saving the state in localStorage and synchronizing with the server. I also had to optimize rendering so that only necessary components were updated during changes, using React.memo and useCallback hooks.

This allowed creating a user-friendly and responsive interface, which users appreciated for its flexibility and ease of customization.