Hiroki Ota focused on targeted reliability improvements in autonomous driving software, addressing two critical bugs across the autowarefoundation/autoware and technolojin/autoware.universe repositories. He resolved a build reliability issue by aligning CCACHE_DIR configuration with user home directories, reducing cache-related failures and streamlining developer onboarding. In parallel, he enhanced perception data freshness by introducing timestamp-based deduplication for external traffic light predictions, ensuring only the latest information influenced decision-making. Working primarily in C++ and YAML, Hiroki applied skills in CI/CD, configuration management, and robotics. His contributions demonstrated depth in diagnosing root causes and implementing robust, maintainable solutions within complex codebases.