What was the most complex technical problem you faced in your project?

One of the most complex technical problems I faced was related to optimizing the performance of a multithreaded Java application. The problem was to correctly synchronize access to shared resources without locks, which led to performance degradation.

To solve this, I used mechanisms from the java.util.concurrent package, such as ConcurrentHashMap and AtomicInteger, and applied lock-free programming patterns. This significantly increased the speed and avoided race conditions.