Pretty much anything you can imagine from front-end web to embedded circuits. Thing to keep in mind with Boulder is that it suffers from the same building restriction effects as SF, combined with explosive population growth, so you're going to pay out the nose for every square foot of living space. As long as you build that fact into your salary negotations Boulder is going to be awesome with a quality of life eons better than the coasts IMO.

I live in Colorado Springs for family reasons but would happily live in Boulder if things were a bit different.