During February 2026, Pbar developed a unified signing architecture for the facebook/sapling repository, focusing on extensibility and security in commit signing workflows. Leveraging Python and backend development skills, Pbar consolidated existing GPG signing logic into a single SigningConfig abstraction, enabling seamless dispatch to pluggable backends such as GPG and SSH. The new SSH signing backend, built with SSH and git integration, supports multiple key formats and writes signatures directly into the git gpgsig header. Comprehensive documentation updates ensured backward compatibility and future readiness, while the architecture reduced maintenance overhead and positioned the system for easy integration of additional signers.