Worked on maintaining and improving the facebookresearch/faiss codebase, focusing on code refactoring and macro management using C++. Addressed technical debt by removing an unused and misnamed READSTRING macro from the io_macros.h file, which reduced code clutter and minimized the risk of future misuse in the IO path. Standardized macro usage to enhance macro hygiene, clarifying definitions and laying the foundation for safer macro expansions. No new user-facing features were introduced during this period, as the primary goal was to improve long-term maintainability and reduce risk through targeted cleanup and risk mitigation in the IO macro area of the project.