Ruby on Rails
For last five years I've been participating in and leading the development of several large Ruby projects (not only web-oriented).
I deeply know Rails and Merb internal code.
I participate in Ruby community and often contribute to famous projects, such as Cucumber, Watir, etc. See my profile at a github: http://github.com/DanielVartanov
I passionately adopt ideas of agile development and successfully completed several enterprise projects using these techniques.
Before programming in Ruby I participated in development of enterprise