Worked on the KiCad/kicad-source-mirror repository to deliver a feature aligning electrical spacing calculations with the IPC-2221C standard. Using C++ and leveraging expertise in embedded systems and PCB design, the developer expanded value-case coverage and updated the clist data model to reflect new spacing rules. The technical approach included synchronizing the data model and user interface, updating grid columns and help text to guide users on compliant spacing decisions. This work enhanced design-rule accuracy and reduced manufacturing risk by providing clearer guidance within the tool. All changes were committed with traceability, focusing on robust feature delivery rather than bug fixes.