Tell us about the most challenging task you have solved and a task you couldn't quite manage to handle.

One of the most challenging tasks I faced in frontend development was optimizing the performance of a large single-page application (SPA) built with React. The application had many complex components and extensive state, which led to noticeable delays and lag during interactions. To address this, I conducted rendering profiling, identified bottlenecks, implemented component memoization with React.memo and useMemo, and optimized state management by splitting it into local and global parts. As a result, I significantly reduced unnecessary re-renders and improved interface responsiveness.

A task I couldn't fully resolve was migrating a large project from AngularJS to modern React. Due to limited time and resources, I couldn't cover all cases with tests or ensure a smooth transition without temporary bugs. Consequently, some functionality had to be temporarily left on the old platform, which created challenges in maintenance and integration. This experience taught me the importance of careful planning and phased migration with comprehensive testing.