Abstract: There are policy, technical, and workflow gaps in library efforts to preserve online journal literature. Since libraries are increasingly involved in journal publishing, HathiTrust, a shared preservation-quality digital repository, is a natural place to archive and provide access to journal literature to ensure its long-term preservation and discoverability. The University of Michigan Library is funding the creation of mPach, an open-source, end-to-end publishing system in which archiving in HathiTrust happens as a byproduct of publication rather than being carried out after the fact. The architecture of mPach, its envisioned workflow, and plans for creating a shared infrastructure for publishing open-access journals are all summarized.