I'm a full-stack Rails engineer with 4 years of professional experience. I've worked solely at high-paced startups that required me to wear many hats. My bread and butter is server-side code in Rails, but, by the nature of startups, I've never been able to fully specialize in any one area. I've built everything from API servers, iOS libraries, Ruby gems, classic Rails apps, backbone.js single-page apps, node.js apps, and a lot of things in between.
Check out http://github.com/ahlatimer for a sample of some of my code.