Kukuk contributed to the PowerShell/openssh-portable repository by implementing 2038-safe login and logout tracking using the wtmpdb library. He updated Makefiles and configuration scripts to integrate wtmpdb, replacing the traditional wtmp approach and ensuring session accounting remains reliable beyond the year 2038. His work involved system programming in C, with a focus on build systems and configuration management to support the new library at both build and runtime. By adjusting login record handling to use wtmpdb, Kukuk addressed long-term compliance and maintainability, laying the foundation for broader migration to 2038-safe utilities within the project’s session tracking infrastructure.