During May 2025, Jan Vaclav worked on the systemd/systemd repository, focusing on enhancing reliability and maintainability through targeted low-level improvements. He addressed memory alignment and data integrity issues in pidfd-util and cgroup-util by safely casting f_handle, which reduced alignment warnings and preserved inode ID retrieval. Additionally, Jan standardized IPv6 address handling in in-addr-util.c by adopting s6_addr* macros, improving consistency for future development. His work, implemented in C and leveraging expertise in memory management and system programming, reduced memory access risks and clarified interface behavior, laying a solid foundation for safer refactoring without introducing user-facing API changes.