Worked on the roc-lang/roc repository to deliver targeted improvements to the CLI and download workflows, focusing on enhancing developer experience and product reliability. Developed two feature sets in Rust and Zig, emphasizing robust error handling and clear documentation. The CLI now provides more informative error outputs and displays relevant documentation comments without requiring verbose mode, streamlining onboarding and troubleshooting. Download failure scenarios were addressed with clearer messages and actionable, numbered suggestions, reducing time-to-diagnose issues and support overhead. The approach prioritized maintainable code, comprehensive testing, and improved reporting, resulting in a more reliable backend and smoother workflows for end users.