Clojure is often lauded, but you don’t see too many teams actually using it to build production systems. “Why Clojure?” is what the Penpot team gets asked the most, so they lay their reasoning out in this article. The TLDR:

Though it is not a mainstream language, Clojure was the right language for Penpot to choose because of its key features: stability, backwards compatibility, and syntactic abstraction.