I'm kind of a mathematician-programmer hybrid.
I like both symmetry and asymmetry.
I also like to see beautiful solutions for clever puzzles - here's a short list with some of my favorites:

• Florian F's answer on Doctor's Dilemma
• D Krueger's answer on Magician's hide and seek with 8 cards

Some of my posts which I'm particularly fond of:

• My answer on How many sevens?
• My really long answer and the joint effort behind it on Bar-coded Message (Reverse Engineering)
• My answer on 100 Prisoners and a clock
• My answer on Dinosaur Egg Drop v2
• My answer on Prime Circuit Optimisation

Pardon for my broken English.