Not so long time ago, I was very useful as Full-Stack Rails developer for 27faces project. It is like AI as a Service platform that can be pretty helpful as solution of a bunch of marketing problems. The main idea is to recognize the faces of the people staying or walking in front of regular camera connected to PC. The system can classify viewers by age, gender, their attention and mark the time visitors spent near the camera. It’s possible to collect such statistics from a set of configured camera-points on the server side and represent the data in the form of charts, that all business analysts love. I was working on back-end, UI, data collection, charts and devops. The implementation is standard rails application + set of usual gems, so, solution is robust. Besides, there are Bootstrap for UI and amazing Capistrano for deployment. In despite of node.js hype, rails is still sexy and widely used.