AvantCredit (Chicago) is hiring senior data scientists, data engineers, and data dev ops. We offer competitive salaries and a flexible work environment.
We have gone from 0 to 150 employees in a little under fifteen months and have raised more money last quarter than all other Chicago startups in the same period last year combined. (http://bit.ly/1hp2cx4)
Our stack is Ruby on Rails and R deployed on Heroku and AWS, respectively, and we do not mess around. All of our R packages are documented, tested, and vignetted. We have continuous deployment and integration (yes, on the data science side!), and all of our classifiers are automatically backtested and validated.