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Re:Clojure at Netflix (2013) [slides] by Dirlewanger on Wednesday October 31, 2018 @09:54AM (#18345669)
CircleCI uses ClojureScript last I read.
Re:Clojure at Netflix (2013) [slides] by shady-lady on Wednesday October 31, 2018 @10:01AM (#18345736)
Re:Clojure at Netflix (2013) [slides] by smoe on Wednesday October 31, 2018 @11:06AM (#18346283)
That link only refers to the frontend where they used to have ClojureScript.

Judging from their backend job postings they seem to use Clojure and Go. .