What difficult cases did you encounter at your last job (RTK)?

At my last job at RTK, I encountered several challenging cases:

• Optimizing interface performance when working with large volumes of data. For example, implementing virtualization of lists and tables to avoid rendering all elements at once, and loading them as the user scrolls.

• Cross-browser support and responsiveness. Tasks included ensuring the correct operation of complex UI components across different browsers and on mobile devices with various screen sizes.

• Integration with legacy APIs and systems. Often, I had to write wrappers and adapters to interact with services that did not always have a convenient or modern interface.

• Ensuring security and protection against XSS/CSRF. In projects with a large amount of user input, I implemented multi-level validation and protection.

• Working with real-time data. For example, implementing real-time UI updates via WebSocket, which required careful state management and synchronization.

These cases required a deep understanding of frontend technologies, the ability to optimize, and to write robust code.