Currently, I am working for a small start-up company called Microlution that manufactures micro-machining centers that can make precise and small parts. We currently have 3 micro CNC mill product lines (3 and 5 axis), with one micro CNC lathe product line that will be released this spring.
http://microlution-inc.com/ (New website is also coming soon...)
I am a mechanical engineer working as the testing engineer, which is one part mechanical, one part electrical, one part software, one part lasers, and one part organization. I troubleshoot various problems with functionality and performance, and ensure final quality. On working for a small company: it is very challenging and very rewarding to see that your work has a clear impact (sometimes immediately). There are plenty of pressure and deadlines along the way.
Before this job, I had a variety of jobs, including testing massive diesel engines, simulating small crack growth out of material impurities, determining properties of mud in a lab, and adding sensors to blow-out preventors.
The best thing about becoming an engineer is that you learn how to learn. Your education doesn't end with your degree. It stops when you stop asking questions.