While working at Instant Automatic I designed Listnr, an independent music discovery web app. (Think of it as something like Spotify for Soundcloud and Bandcamp.) This was a big project that I spent several months working on every day, and the current version is the third major revision.
My role was design of all different types. I worked with our team to help define the product as a whole (who it was for and what it would do), what features it would have (refining down the feature set to a minimum viable product we would build), visual and conceptual design of features, and finally front-end web design writing HTML and CSS (SASS) and making minor tweaks to the Django app.
Designing a web app was learning experience and a really fun time. If you're interested in Listnr feel free to head over there and check it out.
You can see a few more images from the development of Listnr on Dribbble.