My current job. It is a startup which develops an Inbound Marketing platform for the Brazilian market. The app is written in Ruby on Rails. We already have 600+ clients and our main focus now is solving lots of scalability issues.
I worked at the Digital Convergence Center, implementing the Java DTV (Ginga) specification.
A startup in which we created a T-commerce (e-commerce for interactive TV). Back-end was Ruby on Rails, and front end written in Java, using Java DTV.