Worked on the conda/rattler repository to improve backend reliability and command line interface stability using Rust. Addressed a logic bug in environment variable handling by refining the collect_env_vars function, which reduced unnecessary warnings and improved clarity for developers working with multiple variable sources. Added regression tests to ensure only genuine conflicts trigger warnings, demonstrating a focus on robust testing and code quality. Further enhanced the CLI by implementing comprehensive error handling for version parsing, preventing crashes from malformed virtual package versions. This work strengthened input validation and reduced incident risk, supporting more reliable automation and user workflows in backend systems.