I work for a large consulting company that does work all around the world. From what I've seen, the midwest appears to have a pretty heavy use of .NET and other Microsoft technologies. Very large banking and insurance companies moving their .NET code bases to Azure. As you move further to the coasts, AWS takes over more as the cloud provider of choice for most enterprises and you see a lot more Java. Right now I'm looking for .NET + Azure architects in Iowa, Nebraska, Minnesota, Kansas and Illinois.
