TeX is for me a lot like Unix: there is always something new to explore. I am especially curious to learn more about plainTeX for writing some domain-specific macros. I am happy to share my knowledge from writing scientific documents in computer science. These days I'm using LaTeX mostly for reports, sometimes in combination with R, for serial letters, and for creating (PDF) forms.
In my day job I'm working as a product manager for webmate - an online tool for non-functional testing of web apps. On GitHub you can find some of my projects. Most of them are implemented in OCaml, my favourite functional programming language.