Worked on security hardening for the commonwarexyz/monorepo by enabling overflow checks across all Cargo build profiles, including bench, dev, release, and test. This change, implemented through careful build configuration in TOML, proactively mitigated the risk of arithmetic overflow errors at runtime. By linking the update to specific security tasks, the work improved traceability and aligned with ongoing security initiatives. No separate bug fixes were recorded, as the focus was on preventive measures to enhance code safety and CI reliability. The approach demonstrated attention to maintainability and security, leveraging build configuration expertise and a strong understanding of secure development practices.