Tell about the most complex or interesting task you managed to solve in your professional activity.

One of the most interesting challenges I faced in Node.js was related to optimizing server performance when handling a large number of concurrent requests. It was necessary to implement a system that efficiently processed thousands of parallel connections without blocking the main thread.

To solve this, I utilized Node.js's asynchronous programming capabilities, implemented a connection pool to the database, and applied caching at the application level. I also had to carefully debug error handling and timeouts to prevent hangs.

As a result, we significantly reduced response times and increased the resilience of the service under load, which positively impacted the user experience.