During March 2026, contributed to the facebook/sapling repository by developing a reliability-focused enhancement for the build pipeline. Built a configurable mechanism in Rust to block absolute symlinks within the block_invalid_symlinks hook, addressing build failures caused by problematic symlink paths. The solution introduced regex-based path checks and a dry-run mode for safe rollout, allowing violations to be logged without interrupting builds. Cross-platform detection of Unix, Windows, and UNC absolute paths was implemented, while integration with existing ignore rules minimized false positives. This backend development work improved CI stability and provided teams with flexible controls to prevent regressions from absolute symlinks.