Yep, maybe the mods can change the title to reflect that this is the software GitLab the company uses.

This was probably submitted to Hacker News after someone saw my tweet https://mobile.twitter.com/sytses/status/1319325053217992704 which has some questions and answers in the replies.

John already linked to the architecture of GitLab the application in https://news.ycombinator.com/item?id=24869339 in case you are interested in that.

Happy to answer any questions about either.