Yes, people do build anything with Lisp, that is why there are at least two commercial Common Lisp systems around, LispWorks and Allegro Common Lisp.

Google Flights is an acquisition of a company using Lisp, ITA Software, they even have a Lisp guide.

https://google.github.io/styleguide/lispguide.xml

In Portugal, Siscog used to be a Lisp shop, no idea nowadays.

Then you have the Clojure based companies, where Datomic and Nubank are two well known ones, even if not a proper Lisp, still belongs to the same linage.

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vindarel 2 hours ago | parent [-]

Yes, SISCOG is still kicking. From last year's European Lisp Symposium: https://www.youtube.com/watch?v=hMVZLo1Ub7M

	▲	pjmlp 2 hours ago \| parent [-]
		Obrigado. Thanks. I was aware of the company when I was still living in Lisbon, a few decades ago.