Worked on the ScrollPrize/villa repository to deliver security hardening, concurrency improvements, and performance benchmarking for backend systems. Addressed crash risks by implementing robust input validation and bounds checking in the GridStore loader using C++ and libtiff, preventing out-of-bounds reads and division-by-zero errors from malformed files. Improved multi-threaded code reliability by fixing shared mutex handling in GrowSurface, enhancing compatibility with macOS and libc++. Developed a new performance regression benchmark suite for QuadSurface::gen(), integrated as an optional CMake test target. These changes collectively improved cross-platform stability, security, and provided actionable performance metrics for ongoing optimization and maintenance.