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Re:Why is Common Lisp not the most popular programming langu... by tonyarkles on Thursday February 15, 2024 @08:15AM (#39382280)
While ITA no longer exists as a separate entity I don’t think, my understanding is that they pretty much wrote everything in Lisp.

https://en.wikipedia.org/wiki/ITA_Software

https://franz.com/success/customer_apps/data_mining/itastory...

Grammarly too, although I don’t think it qualifies as a 20-year codebase: https://www.grammarly.com/blog/engineering/running-lisp-in-p...

Re:Why is Common Lisp not the most popular programming langu... by farray on Thursday February 15, 2024 @02:12PM (#39387069)
ITA started doing everything in Lisp, but especially as the original coding founder left, started hiring people doing stuff in Perl, Python, Ruby, Java, shell, C++, PL/SQL, etc.

The core software was still Common Lisp, but lots of cruft got added, and Conway's Law kicked in mightily.