I also work for the Wikimedia Foundation, but I use my staff account for edits made in that official capacity. Take a look at that page for more about my work at the Foundation. Before November 2014, I had been using this account to do my official work as staff as well, so many older grant discussions here on Meta will show official edits by me.
I have been a practicing (volunteer) Wikipedian for many years; my home wiki is the Hebrew Wikipedia, but I make occasional contributions on the English Wikipedia as well. I have a strong background in software engineering, and an abiding interest in literature, education, open access, linked data, and library science.
(All tools I write are open-source and available on GitHub.)
GLAMify -- for a given category on Commons, suggests images for articles based on another Wikipedia's use of those images
This tool interacts with Meta (on my own userspace) using the Ijonbot bot account.
ערך יומי בדואל -- a service sending a daily featured article, image, and "today in history" section from the Hebrew Wikipedia.
Cite4WikiNG -- a Mozilla Jetpack Firefox add-on for automagically creating a citation from the Web page you're currently on. This is a re-packaging of the older Cite4Wiki Firefox add-on, and I'm not actively developing it, but if there's interest, I might hack on it some more.
Dhole -- a Ruby gem providing ActiveRecord mapping of main Mediawiki DB entities and relationships
I've contributed some features and patches to Mediawiki-Gateway, the older Ruby Mediawiki API client gem. I still know it well, and am happy to help if you're trying to do something on Mediawiki in Ruby.