Zachary Tan focused on stabilizing the build process for the denoland/chromium_build repository by addressing issues related to the Rust CFI sanitizer integration. He reverted the enablement of the Rust CFI sanitizer after identifying that it caused test failures, and adjusted relevant compiler flags within BUILD.gn to restore build stability. His work centered on build system configuration and patch management using GN and Rust, ensuring that continuous integration pipelines remained reliable and that downstream projects were not disrupted. Although no new features were added, Zachary’s targeted configuration changes improved CI reliability and maintained release readiness, demonstrating careful root cause analysis.