Greetings. My name is Jeremy Trammell and I represent a group of developers and designers in Portland, Oregon, in the U.S. We have extensive experience with the Arduino platform and would be happy to assist you with your project. The software you'll require is, as you anticipated, relatively trivial to put together. If you do not have the hardware already designed, however, that will significantly increase the budget of the project. As an example, you (generally) can't just "throw in" a digital potentiometer and control a motor with it (there are times when that would work in theory, but it's just not how you control motors). So, is the hardware already designed, or do we need to budget for some electrical layout as well as software development? Once we get these questions ironed out, I'll be happy to place a bid on your project and get this taken care of for you right away!