Worked on the pantsbuild/pants repository to deliver a performance-focused feature that optimized local build execution. Developed a vfork-based process execution fast-path in Rust, replacing the slower fork-based pre-exec approach with a process_group-based method. This change reduced process creation latency and memory pressure during local builds, improving scalability for execute_process workloads. The implementation leveraged system programming techniques and performance optimization skills, ensuring compatibility with specific environment prerequisites such as glibc v2.29+. The work included thorough documentation clarifying when the fast-path is used, resulting in more efficient and stable local build performance without introducing new bugs during the delivery period.