In January 2026, Thomas Guichaoua contributed to the rust-lang/rust repository by developing a feature that freezes the last access and write times of files on Windows, addressing the challenge of maintaining consistent file metadata. Using Rust and leveraging Windows file system APIs, Thomas implemented platform-specific logic to control file timestamps, which supports reproducible builds and improves metadata integrity for Windows workloads. This work required a strong understanding of system programming and file system management, and it laid the groundwork for more reliable auditing and continuous integration processes by ensuring that file metadata remains stable across different build environments.