Worked on performance optimization within the JuliaLang/julia repository, focusing on the inference system’s type lattice management. Applied expertise in compiler design, functional programming, and type inference to refactor the codebase by removing outdated Conditional invalidation logic and shifting to ssadef-based stale reference tracking. This approach eliminated redundant functions and loops, streamlining the inference module and reducing the risk of future refactor complications. The changes improved maintainability and throughput, targeting faster compilation and lower resource consumption for large Julia projects. No major bugs were addressed during this period, as the primary effort centered on long-term stability and performance enhancements.