Worked on the RelationalAI/julia repository to enhance reliability and concurrency safety in AOT compilation workflows. Addressed a thread-safety issue in semaphore usage by replacing thread-unsafe getenv calls with a hard-coded semaphore name, reducing risks associated with concurrent access. Improved error handling by introducing warnings for unexpected errors during semaphore operations, which aids debugging and observability in build environments. The work focused on stabilizing the build process rather than adding new user-facing features, emphasizing robust system programming practices. Utilized C++ and applied expertise in concurrent programming and error handling to deliver a targeted bug fix that improves CI and build reliability.