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You can ask them a single question to know the answer: do they have any cats/scalaz in their production code? Without their ilk Scala 10 years ago was the language Kotlin and Java are still trying to be.

But from what I have observed in the last few years Scala is either used in legacy projects or you're talking to a hard-core FP shop. The saddest fact that it's true even in Data Engineering with Spark :(