I'm a moderator here and on some other Stack Exchange sites. I'm pretty active on the SE network.
Professionally, I'm a technical writer who works with (and often helps design) programming interfaces. I've written programming guides, tutorials, reference applications (runnable examples), reference documentation (for Java, C++, C, SOAP, and REST APIs), and even a little user documentation. Here on SE I wrote a tutorial for the Data Explorer. I'd love to see more technical-writing questions here on Writing!
You can see some of my writing on the Worldbuilding blog, including my Revelation for RPGs series and my (incomplete) serialized story The Sisters' War (start here or read a synopsis of past chapters and jump to the current chapter).