Ruby On Rails
When it comes to fast software development and quick releases, Ruby and Rails are the best choices for many web-applications. With their excellent test coverage, built-in security features and well-established vulnerability procedures they provide expandability over a long lifecyle.
Sometimes Ruby is not the perfect fit as backend, for example in real time processing with technologies like WebSockets. For those cases we tend to use Elixir. It is a very modern language based on Erlang and an ideal solution for extreme robust and scalable applications.
AngularJS and React
Each framework has its top use cases. For UX-enhancements and many single-page usecases, we found AngularJS and React our tools of choice. They help us build up a logical, self-explanatory code structure that even inexperienced developers can dive right into.