Jack of many areas, master of none. I have worked on various tools development in VOIP, Mobile Phone technologies, Search and Ad platforms, Mozilla Firefox internals - spanning various companies. After all this, I cannot claim mastery in anything, but little bit on many things.
Q&A for professional and enthusiast programmers
Q&A for professional system and network administrators
Q&A for people studying math at any level and professionals in related fields
Q&A for computer enthusiasts and power users
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for linguists, etymologists, and serious English language enthusiasts
Q&A for professional programmers interested in conceptual questions about software development
Q&A for statisticians, data analysts, data miners and data visualization experts
Q&A for IT security professionals
Q&A for people who want to be financially literate