Worked on improving the reliability of OS signal handling in the oven-sh/bun repository, focusing on backend development using C++ and JavaScript. Addressed a bug where removing one of multiple signal listeners would prematurely uninstall the OS signal handler, potentially disrupting remaining listeners. Implemented a guard to ensure the handler is only uninstalled when no listeners remain, preserving correct signal processing. Developed and validated targeted tests to cover edge cases involving listener add and remove cycles, using both system-level and existing signal tests. This work enhanced the robustness of signal handling and increased test confidence for BunProcess in production environments.