Alexilin focused on strengthening build safety within the denoland/chromium_build repository by enabling static analysis for unsafe buffer usage in critical modules. By removing exclusion entries for unsafe_buffers in the signin and google_apis directories, Alexilin ensured that potential unsafe buffer operations would be flagged during the build process, allowing for earlier detection and remediation of vulnerabilities. This work involved careful build system configuration and a deep understanding of build tooling, with changes implemented in text-based configuration files. The approach improved code safety and aligned the repository with modern build-time safety checks, demonstrating thoughtful engineering in build configuration and static analysis integration.