Check out Scala! It has modern features and the tooling around it is mature. If you like books, this should be a good intro: https://underscore.io/books/essent

Check out Scala! It has modern features and the tooling around it is mature. If you like books, this should be a good intro: https://underscore.io/books/essential-scala/ https://underscore.io/books/essential-scala/ (you should use IntelliJ IDEA instead of Eclipse, though) And you can also use it for frontend development: https://www.scala-js.org/doc/sjs-for-js/es6-to-scala-part1.html https://www.scala-js.org/doc/sjs-for-js/es6-to-scala-part1.h... (having one language for both backend and frontend leads to great synergy)