Andrey Andreyev developed two core features over a two-month period, focusing on performance monitoring and debugging in large-scale open-source projects. In the facebook/react-native repository, he implemented a C++-based performance logging system that reports JavaScript events as instant track markers for sytrace, enhancing timeline fidelity and aiding debugging. Later, in google/perfetto, he delivered source-line aware Breakpad symbolization, extracting source line information from Breakpad files and integrating it with traceconv symbolize to map machine addresses to source locations. His work demonstrated depth in native development, C++, and debugging, directly improving observability and crash diagnosis for complex application builds.