It was my main language for 5 years, and there was always a variety of Scala jobs in Berlin: companies of different industries, sizes. Recently, I mainly used Python at work. I love Scala and wonder if it makes sense to invest in keeping up my Scala 3 skills.
https://trends.google.com/trends/explore?cat=31&date=today%2...
Kotlin and Groovy both look pretty stable - both having core uses in their domains that I am guessing support continued traction as "the best tool for what they do". Scala I think peaked when it had the overlap b/w business use and data science.
I feel like Kotlin / Scala / Java are all after the same essential core market - a solid, type safe language to shoulder the huge broad need of enterprises to keep business software pumping away reliably. So they are essentially all part of the ebb and flow of the one giant "JVM" ecosystem.
Groovy sits a little outside of that since it specifically targets a different type of problem (providing an optimally integrated JVM scripting language for DSLs and rapid application development).
There are also lots of agencies using Scala, some machine learning and security stuff. Munich is a good place, Berlin, Zurich and Lausanne, if you want to stay in Europe.
I love the language and I'm very happy to get paid to do stuff in it. I don't think I ever learned that much using just one language, Scala is definitively a class of its own.