Jack Feeney worked on slimming the VyOS kernel configuration within the psleng/nexus-build repository, focusing on embedded systems and kernel configuration using C. He reduced the enabled kernel features in the VyOS defconfig, resulting in smaller and more maintainable kernel builds. This targeted approach decreased the build size and maintenance surface, enabling faster feedback cycles and improved configuration governance. While no major bugs were addressed during this period, Jack’s work demonstrated a methodical reduction of unnecessary kernel options, directly impacting the efficiency of the build process. The depth of the work lay in careful selection and validation of kernel features.