The team I work with use the Spring framework for backends and REST APIs, and most of what we make are webapps. I also know a good number of companies (at least in my area) that hire java developers.
As for C# I would image there are a decent number of people who use it for .NET. The only time I ever used it was in my senior capstone, though.
As for C# I would image there are a decent number of people who use it for .NET. The only time I ever used it was in my senior capstone, though.