Ahmet Altinay contributed to the SagerNet/gvisor and google/gvisor repositories, focusing on system-level reliability and security. He addressed a file descriptor leak in SagerNet/gvisor by ensuring the MemoryManager correctly manages file descriptors across execve calls, adding regression tests to validate the fix. In google/gvisor, he implemented and later rolled back SO_PEERCRED support for UNIX domain sockets, enhancing and then restoring credential handling to maintain backward compatibility. His work involved C++ and Go, leveraging expertise in Linux internals, socket programming, and memory management. Altinay’s contributions demonstrated careful attention to production stability, regression risk, and robust system programming practices.