Experience in detail.
Harihareswara wrote MediaWiki's performance and architecture guidelines, revamped and ran its Requests for Comment process, wrote and triaged bug reports, broke bottlenecks in patch review, and ran hackathons. The new contributors and maintainers she recruited, mentored, and shepherded from 2011 to 2014 have made the MediaWiki community more sustainable and more diverse.
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.
Harihareswara assessed the state of the codebase and the project's friendliness to new developers as of late 2013, producing a list of issues to fix.
The volunteers who develop a web application to manage the scifi convention WisCon had a jumble of bug reports and feature requests in BaseCamp, Google Code, old emails and text notes. Over a few months in 2011, Harihareswara consolidated and organized those TODOs into a prioritized queue, and kept the team on one page via BaseCamp updates and a weekly conference call.