During March 2025, Justin Cohen contributed to the denoland/chromium_build repository by implementing a targeted debugging feature for iOS builds. He introduced a conditional build argument that enables AddressSanitizer (ASAN) specifically for debugging a known issue, allowing ASAN activation only when explicitly requested. This approach preserved the default behavior for stable releases while accelerating issue diagnosis on development and beta channels. Justin’s work focused on build system configuration and debugging, utilizing GN as the primary language. The solution provided a controlled mechanism for enabling advanced diagnostics, reflecting a focused and pragmatic engineering approach to platform-specific problem solving.