[argonaut]

Most of those companies use a bunch of technologies, Scala being only a small part of their stack. Only a few of those companies use Scala as their main language.

[joshlemer]

Is it really common for companies to have a single dominant language though? It seems that most companies have their eggs in four or so baskets.

[argonaut]

Yes, totally. I'm talking about their core language. LinkedIn's core language is Java. Google's main languages are C++ and Java. Pinterest is mostly Python. Quora's core is Python. Stripe's core is Ruby.