I'm a 5-years experienced developer.
Java is like my mother tongue, I wrote and debugged thousands and thousands of lines of Java code. Wicket, Spring, OpenJPA, JUnit, Quartz, BouncyCastle, Guava and Tomcat are part of my toolbox.
Python is like my second tongue. I teach it to undergraduates students of Mathematics and Physics. Most web apps I develop are done with Pyramid and PostgreSQL.
I love to deploy to OpenShift, what a great PaaS it is!
Talking about OSes, Ubuntu, RedHat and OS X are my daily pleasure, and will feel confortable with any Linux distribution, have written many bash scripts. Windows? Please don't!