Worked on stabilizing the LLVM code generation path in the mozilla/gecko-dev repository by addressing static data initialization issues. The approach involved replacing the use of lazy_static with Rust’s std::sync::OnceLock, which improved initialization reliability and reduced codegen-related bugs. This change led to more deterministic builds and tests, enhancing both thread safety and maintainability of the codebase. The work included implementing a targeted workaround for a specific LLVM codegen bug, directly contributing to lower release blockers and smoother development workflows. Focus areas included compiler internals, systems programming, and leveraging Rust’s modern synchronization primitives for robust static initialization.