http://therobert.org
technoguyrob at gmail dot com
Shameless plug: If you want to get paid to write complex R packages for a living, I'm working at a startup right now doing exactly that and deploying hundreds of models to Amazon's EC2, auto-scaled using ElasticBeanStalk (so our analytics can never fail to scale!).
I also use test-driven development (R's testthat and testthatsomemore), continuous integration (travis), massive datasets (h2o, redshift), rigorous package development (devtools and CMD CHECK), and difficult meta-programming (duck typing over arbitrary OOP types?--all in R. If you're answering SO questions, you're already way ahead of the curve, so come say hi!
I also do a lot of Ruby, Python, Coffeescript, and MAGMA.