The book tells about Clojure - the modern dialect of Lisp. It is a functional language with an emphasis on immutability and multithreading. It appeared ten years ago and is gradually gaining popularity in Russia. In seven chapters, we look at how to work with Clojure in production. This book is not for those who learn the language from scratch. The reader is expected to be familiar with Clojure or another dialect of Lisp. To better assimilate the material, it is desirable to have programming experience. For an advanced audience.