I can't speak for other cities because I haven't watched their job markets enough, but anecdotally in Chicago I've seen it break down mostly like this: Big com

I can't speak for other cities because I haven't watched their job markets enough, but anecdotally in Chicago I've seen it break down mostly like this: Big companies use enterprise Java unless they're stuck with a legacy VB/ASP/Coldfusion stack, with C# less commonly. Fintech companies use a mix of C# and C++. Small companies started before ~2010 use PHP, with Rails less commonly. Small companies started after ~2010 use Rails, with hipster Java (Scala/Groovy/et al) less commonly. I can only remember offhand seeing one job ad for a company using Sinatra instead of Rails for their Ruby stack.