Hello jls,
I'm a current grad student at the University of Colorado working on my Master of Engineering in Geographic Information Systems. I have a lot of experience with ArcGIS, coding, and web development. I'm not an HTML5 expert, but I have done some work with it. I have my own development server that I can use to test and design on. If you can provide some additional details, I would be more than happy to give you a more specific proposal on how I would plan to go about finding solutions, and if I've done similar work, provide examples.
Thanks,
Andrew