Java hacker. In a previous life a C hacker. Ton of distributed architecture experience, lot of networking/multithreading, some ORM knowledge. ORMLite primary author.
I tend to concentrate on StackOverflow questions that I enjoy. I certainly have experience in other areas just I don't have the time to sit on all question categories.
Q&A for professional and enthusiast programmers
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for peer programmer code reviews
Q&A for professional programmers interested in conceptual questions about software development
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Q&A for professional system and network administrators
Q&A for computer enthusiasts and power users
Q&A for power users of Apple hardware and software
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for apps, scripts, and development with the Stack Exchange API
Q&A for scientific skepticism
Q&A for people studying math at any level and professionals in related fields
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Stack Exchange Network staging zone, where users come together to build new Q&A sites