Scala is perfect for just delivering, myself and my business partner have been using it to rapidly prototype and build for a decade now. You just avoid all the stuff that tries to make scala into haskell and use it as the hybrid OO/functional language is was designed as.
You're lucky that you can do that kind of work. I've been working for a state company in Bulgaria and we had to maintain some Scala pipelines built with Apache Spark some years ago. It wasn't a pleasant experience, just a sea of vars/vals and cases of reinventing the wheel only to use some functional constructs when it could be simply done in Java by just adding a dependency that has already solved that problem like 10 years ago. It wasn't even some complicated logic in that, just calling different APIs and playing with dataframes, but the fact that they hid from me so much behavior only to reduce verbosity gave me some stressful days.
