Nihal Ajayakumar enhanced the uutils/coreutils repository by developing a Windows-focused extension to the cross-platform testing framework. He implemented Windows-specific checks for file readability, writability, and executability, ensuring that tests accurately reflect Windows behavior and align with Linux and macOS standards. Using Rust, he addressed lint issues by refactoring code to satisfy clippy requirements on Windows targets, which improved code quality and maintainability. His work reduced CI flakiness on Windows, increased test reliability, and laid the foundation for broader Windows coverage in future development. The project demonstrated depth in cross-platform development, testing, and Rust-based engineering practices.