Sergey K.

I am an experienced React developer with strong proficiency in React JS, Next JS, HTML, CSS, SCSS, and SASS, along with a solid understanding of modern frontend architecture. Over the years, I have built scalable, interactive, and responsive user interfaces that follow industry best practices.

I also have solid hands-on experience with WebSocket-based real-time systems. I’ve implemented features such as live updates, real-time notifications, presence tracking, and bidirectional data synchronization. I’m comfortable working with both native WebSocket APIs and libraries like Socket.IO, handling connection lifecycle management (connect, reconnect, disconnect), heartbeat/ping strategies, and fallback mechanisms when needed.

I’ve dealt with real-world challenges like message ordering, race conditions, throttling high-frequency updates, and ensuring data consistency between client and server. I’ve also implemented reconnection strategies with exponential backoff, message queuing during connection loss, and state recovery after reconnect.

On the frontend, I’ve integrated WebSockets with state management solutions like Redux and React Query patterns to maintain a predictable and consistent data flow. I’ve also worked on optimizing performance by minimizing unnecessary re-renders and batching real-time updates efficiently.

Additionally, I have experience debugging WebSocket communication using browser dev tools and network inspectors, identifying issues such as latency spikes, dropped connections, and payload inconsistencies.

In addition, I have some experience building projects with React Native. I am proficient in TypeScript and have worked extensively with state management libraries such as Redux and MobX.

Beyond frontend development, I am familiar with backend technologies including Python and Django, which helps me better understand full-stack architecture, API design, and real-time backend integrations.

I am experienced in automated testing using tools like Selenium for browser automation and Jest for unit testing in JavaScript.

Additionally, I have a deep understanding of browser internals, including rendering engines, the Document Object Model (DOM), and how web content is processed and displayed.

With a diverse skill set and a commitment to staying up to date with the latest trends in the React ecosystem, I aim to deliver high-quality, scalable, and efficient solutions in every project I take on.