Jitsu contributed to the itchyny/go and golang/go repositories, focusing on backend and command-line interface development using Go. Over two months, Jitsu enhanced reliability and usability by implementing robust filename validation for embedding features and improving directory handling on non-symlink systems, addressing cross-platform build failures. In golang/go, Jitsu refined command lookup logic to ensure accurate subcommand identification, streamlining CLI workflows. Additionally, Jitsu updated Go profiling documentation to align with modern pprof flag names, reducing onboarding friction for developers. The work demonstrated a thoughtful approach to error handling, documentation clarity, and cross-platform robustness, reflecting a solid understanding of Go programming practices.