I have volunteered with Code for America since the Fall of 2013 and have been on the Core Team since January 2014. My activities evolve depending on current projects. Featured:
Code for San Francisco logo (featured above in slideshow)
Local Free Web
A service designed to help folks with no internet enabled devices to find internet access without needing the web to find a location. How it works: people text a Muni bus stop number to the given number. The locations of the closest free internet enabled computers are texted back.
When I joined the project it was a function application but required user UX/UI for the website. Offline marketing materials also needed to be created to explain how to easily use the service. I created a unified online/offline experience. The offline experience uses the time tested guerilla marketing tactic: flyers on phone poles to target folks with no internet enabled computers while they wait for buses.