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Re:Phabricator – GitHub Alternative written in PHP used by t... by elygre on Wednesday June 06, 2018 @11:13AM (#17247776)
GitLab itself is almost exclusively Ruby. Go is used in several newer services (pages, ci, gitaly, more).

See https://gitlab.com/gitlab-org/gitlab-ce/graphs/master/charts for the core server.

Re:Phabricator – GitHub Alternative written in PHP used by t... by kuschku on Wednesday June 06, 2018 @05:03PM (#17251111)
Sure, but all the performance-critical stuff is in gitaly and the others.