Have you already performed improvement and refactoring of existing code in your projects?

Yes, in my projects I have repeatedly engaged in improving and refactoring existing code. This usually involved:

• Refactoring for better readability and maintainability.
• Performance optimization, such as reducing the number of calls to heavy operations or improving memory management.
• Updating outdated APIs and libraries.
• Improving architecture to facilitate adding new features.
• Fixing bugs and addressing technical debt.

For example, in an Android project, I replaced outdated UI methods with modern ones, used ViewModel and LiveData for better code organization and state management, which significantly improved the support and scalability of the application.