I started out doing data mining and database applications and have gradually worked my way "down" - I now work on embedded software in the wireless domain.
Personal Finance & Money
Q&A for people who want to be financially literate
Stack Overflow
Q&A for professional and enthusiast programmers
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Puzzling
Q&A for those who create, solve, and study puzzles
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Travel
Q&A for road warriors and seasoned travelers
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Literature
Q&A for scholars and enthusiasts of literature
Area 51
Q&A for proposing new sites in the Stack Exchange network
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Law
Q&A for legal professionals, students, and others with experience or interest in law
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Ask Patents
Q&A for people interested in improving the patent system
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Astronomy
Q&A for astronomers and astrophysicists
Server Fault
Q&A for system and network administrators
English Language Learners
Q&A for speakers of other languages learning English
Information Security
Q&A for information security professionals
The Workplace
Q&A for members of the workforce navigating the professional setting
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Bricks
Q&A for LEGO® and building block enthusiasts
Interpersonal Skills
Q&A for people looking to improve their interpersonal communication skills
Super User
Q&A for computer enthusiasts and power users