During June 2025, John Archer contributed to the KhronosGroup/SPIRV-Tools repository by addressing a critical issue in the Dead Code Elimination (DCE) pass for SPIR-V generation. He implemented a targeted bug fix in C++ that ensured DebugBuildIdentifier and related debug instructions were preserved during aggressive DCE, maintaining essential debugging metadata in the emitted output. By updating the DCE logic and aligning associated tests, John improved the reliability of debugging workflows and reduced the risk of regressions. His work demonstrated depth in compiler optimization, debugging, and SPIR-V tooling, resulting in more accurate and dependable developer experiences across builds.