Classic Emacs structural editing
Developers using Emacs and Cider will probably be familiar with paredit for their structural editing needs.
Paredit is a very nice library, however, it was only created for Clojure / Lisp languages.
Spacemacs uses Smartparens which provides structural editing for all languages, so paredit is not required.
Paredit is however part of the Clojure layer in Spacemacs, although there are no keybindings defined.