At the company I work for, we have 5 (off the top of my head) different micro services written in Sinatra. Two front end applications built in AngularJS, runnin

At the company I work for, we have 5 (off the top of my head) different micro services written in Sinatra. Two front end applications built in AngularJS, running off a NodeJS backend (which serves the static content), and one Rails application. For the micro-services, Sinatra does the job very well, there is no need for all of the components that Rails provides; we like the flexibility. Our front end developers have complete ownership of the two front-end apps, and they rolled with NodeJS because it allowed them to take advantage of their JavaScript skills. The Rails app is an internal consumption app. It doesn't need to be fancy or have a need to scale. Rails and Bootstrap keep it simple stupid. The meat of our stack is actually on the big data technologies we deal with, RedShift and Hive. We could honestly re-write any of the micro-services in .NET or any other stack for that matter, and still keep our infrastructure mostly the same.