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Depends on what you consider a language. There are a lot of DSLs out there and once you add a couple of configuration files for Jenkins / Git{Hub, Lab} / Bazel / Buck and Vagrant / Docker / Bash and so on you're already at 5 languages and you haven't even added the lethal trifecta of HTML+CSS+JS for your web front-end or Swift+Kotlin if you only want to roll on mobile.

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Yeah, that's a rabbit hole to be sure. I personally only count languages that you write a non-trivial amount of production executable code in. Examples of things I wouldn't count: HTML and CSS, JS in the browser, Bash used in the build system. If you wrote your webserver in Bash for some wild reason, it's included. Mise and Just and Makefiles aren't.

If you exclude HTML/CSS/JS/Makefiles that means you are giving your people an excuse to make a mess of them. You have to count everything. You can say that HTML/CSS/JS are all one since they are tightly coupled and you have to know all 3 if that is what it takes to get under the 10 limit, but you should make it clear you are breaking the spirit of the rule to do that just because of an external factor - and you are not happy about that.

If you write even one line of something you need at least one person who is an expert and takes responsibility to ensure the code written in the language is good.

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