Anything technical that isn't already in my resume usually catches my attention. Extra points if it's related to FreeSoftware.
My main interest is direct involvement in analysis, design and implementation of software, possibly for technically challenging projects. Education technology is my secondary interest.
As long as my role remains prominently technical, I'm always happy to coordinate small projects and mentor junior engineers or interns. I prefer to work with FreeSoftware tools and possibly contribute back to upstream projects.
I enjoy most fields and industries, but I'm somewhat biased towards resource-constrained systems and embedded devices. This doesn't mean that I'm only inclined to think in low-level terms: on the contrary, I've always strived to adapt modern, high-level engineering techniques also when working on small devices.