I have created 20+ software/startups in my 24+ year career. Here is some of the work I can show.
My role was design and front-end development of this Ruby on Rails web application. This includes: wireframing, Photoshop mockups, building the mockups with HTML5/CSS3 (using SASS and the Foundation 3 Responsive Framework) and user testing. I make sure everything works cross-browser and across devices. Other than some of the icons and avatars, everything is HTML5, CSS3 or SVG.