Describe the most complex problems you have faced in your work and how you solved them.

One of the most challenging problems in C++ was debugging memory leaks in a large project with many interdependent modules. To solve this, I used profiling tools such as Valgrind and AddressSanitizer to locate the leak. Then I rewrote the problematic sections using smart pointers (std::unique_ptr, std::shared_ptr), which significantly reduced the risk of leaks and simplified memory management.

Another example is optimizing the performance of an algorithm processing large data arrays. I applied multithreading techniques using std::thread and mutex to parallelize computations, which allowed the program to run almost 4 times faster on multi-core processors.