Harihareswara ran a 2015 PyCon sprint that expedited the GNU Mailman 3.0 release; she prioritized tasks, advised UI decisions, tested the installer and recruited additional testers, and wrote documentation.
She also triaged and closed bugs in the multiple applications comprising the GNU Mailman suite, ported docs from an old wiki, rewrote developer docs, replaced hardcoded English messages with localization template calls, and wrote an LWN article publicizing the new release.