Hans-Filip Elo enhanced the google/perfetto repository by expanding WebUI integration flexibility through targeted Cross-Origin Resource Sharing (CORS) improvements. He introduced support for non-default WebUI origins in both websocket_bridge and trace_processor_shell, enabling deployments beyond the standard ui.perfetto.dev and localhost. Using C++ and leveraging networking and web development expertise, Hans-Filip added new configuration points and build flags, such as --http-additional-cors-origins and GN build support, to allow extra origins. These changes updated both build and runtime configurations, preserving default behaviors while supporting enterprise and custom frontend deployments. The work demonstrated focused depth in C++-based web infrastructure enhancements.