Worked on modernizing the rootfs build pipeline for the kata-containers/kata-containers repository, focusing on improving reliability and flexibility for Ubuntu 24.04 environments. Migrated the rootfs builder from multistrap to mmdebstrap, aligning with updated Ubuntu requirements and enhancing build reproducibility. Updated runtime configurations to support stricter systemd sandboxing, ensuring compatibility with hardened environments. Introduced customizable repository and component settings through REPO_URL and REPO_COMPONENTS, enabling flexible multi-architecture builds. Leveraged skills in Linux, build systems, and shell scripting to deliver features that support cross-architecture deployment pipelines, providing customers and internal teams with more configurable and robust root filesystem build processes.