I'm a self-employed software engineer; you can hire me as a contractor or consultant to work on your iPad, iPhone, Mac or other software. I specialise in usability and interaction design, and most clients hire me for custom GUI design and implementation. My business site is at http://instinctivecode.com/

I've worked with many clients all over the world, including (more than once) a certain company that makes very popular and desirable computers, music players, phones and now also tablet devices.