Sebastian focused on repository hygiene within the openwrt/packages project, delivering a comprehensive Makefile metadata cleanup to align with governance standards. He systematically removed maintainer and copyright lines from Makefiles across the repository, addressing requests from the openwrt-devel community and reducing metadata drift. This work, implemented using Makefile and build system configuration skills, improved license clarity and streamlined metadata, supporting more reliable builds and easier onboarding for contributors. By standardizing metadata and ensuring compliance with project governance, Sebastian enhanced the maintainability of the repository. The depth of the work lay in its cross-repository scope and attention to open-source collaboration practices.