Austin developed comprehensive test coverage for geometric boolean operations in the KittyCAD/modeling-app repository, focusing on the KCL library’s core functions. He implemented simulation test modules for operations such as subtract_self, subtract_self_multiple_tools, and union_self, ensuring that parsing, unparsing, and execution paths were thoroughly validated. Using Rust and leveraging skills in CAD and geometric modeling, Austin’s work enhanced the reliability and regression protection of the library. This approach reduced risk during future refactors and enabled faster, safer feature development. The depth of testing provided a robust foundation for ongoing improvements, supporting the stability and maintainability of geometric operations.