In early 2016, Zulip's documentation was split among multiple README files and sub-sites, and Zulip had a small open source community. Harihareswara reorganized the documentation, wrote an architecture overview, and started a glossary.
She also started and ran Zulip's regular "office hour" livechats, recruited participants via social media, Outreachy, and PyCon, and wrote and triaged bug reports. Harihareswara helped plan and run Zulip's PyCon 2017 sprint and co-staffed PyCon and OSCON booths, running English tutoring sessions as part of Google Summer of Code application assistance, and mentored an Outreachy intern. Zulip now boasts over 300 contributors merging over 500 commits a month, and GitHub recommends it on its curated "Great for new contributors" list.