Have been using Clojure for three years on a dev team of around 10 people. We haven't had any issue with maintenance and extensibility of the code base over tim

Have been using Clojure for three years on a dev team of around 10 people. We haven't had any issue with maintenance and extensibility of the code base over time. I'd say it is as easy to maintain and extend as it was in the beginning. That said, we have a micro-service architecture. Thus the overall system grows horizontally, in that more and more components are built and developed. So individual components don't really grow that large. This would be different say to building a giant monolith like a AAA game, or a massive application like Photoshop. So I can't speak to how such a code base would scale. Also, this might sound strange, but I don't think we've ever had to refactor the code base in those three years. The paradigms of Clojure (data driven/functional/immutable/meta), combined with our architecture, it just doesn't really need you to refactor things to add features. Most adding of features tend to be... Write functions for it. Plug the functions inside the outer orchestration chains of function composition which dictates code flow. Add some more keys to our data-structures. Write tests. Release. Where as in Java, we used to have to shuffle all the Class/Interface arrangements around all the time to make room for new features.