Worked on the elixir-lang/expert repository to enhance reliability and cross-shell compatibility in backend command execution using Elixir. Focused on resolving a persistent issue with PATH handling in the Fish shell, the developer removed unnecessary escape sequences from the PATH variable, which had been causing command failures in both local and CI environments. This targeted bug fix improved the correctness and compatibility of shell commands that depend on PATH, directly benefiting developer productivity and CI stability. The work demonstrated careful attention to shell interoperability and commit clarity, leveraging Elixir and backend development skills to maintain robust, maintainable command execution workflows.