Software engineer. Last system I worked on was an optical networking add/drop multiplexer.
Kewl. A friend of mine was doing similar on flow-control devices. Now he's middle management and just got a new job with a $60K a year raise. He doesn't write a lick of code anymore. Quite frankly, the middle class is splitting apart, into lower middle class and upper middle class, and so many people are studying technology around the world that there is going to be intense competition for jobs in that area.