Cynthia contributed to the geerlingguy/linux repository by addressing cross-architecture compatibility issues in futex selftests, focusing on 32-bit systems with 64-bit time_t. She implemented a patch in C that conditionally defines SYS_futex as SYS_futex_time64 when the former is unavailable, ensuring that selftests compile successfully on legacy architectures. This kernel development work improved build reliability and expanded CI coverage for older environments, reducing the need for manual debugging. Cynthia’s approach demonstrated a solid understanding of system programming and testing, delivering a targeted solution that maintains compatibility across diverse platforms while enhancing the maintainability of the codebase for downstream users.