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Re:25 Years of PHP [video] by minxomat on Sunday September 08, 2019 @06:03PM (#20913722)
Mostly Hack and C++ as far as I can tell from glancing at their recent ACM paper: https://dl.acm.org/citation.cfm?id=3338112
Re:25 Years of PHP [video] by tpmx on Sunday September 08, 2019 @06:13PM (#20913761)
Nice, a very fresh source (August 2019)!

"C++ is the main language of choice for backend services. There are 10s of millions of lines each of mobile and backend code."