During October 2025, BTS refactored the jj-vcs/jj repository to unify and standardize index error handling, focusing on improving reliability and maintainability. By consolidating disparate index-related errors into a single, consistent model, BTS reduced fragmentation in error reporting and simplified debugging across networked components. The work introduced type aliases to standardize result types, enabling consistent I/O error propagation throughout storage traits. Using Rust and leveraging skills in API design, code refactoring, and error handling, BTS completed a focused four-commit refactor that delivered measurable business value by streamlining error management and supporting more robust, maintainable code across the project.