i am professional .net developer.i have intimate familiarity with one (or probably more) of the .NET languages (C#, , etc.) and one (or less probably more) of the .NET stacks (WinForms, , WPF, etc.)..NET is the environment, the libraries, the languages, the CLR, the CLI, JIT, the LR, the BCL, the IDE and the IL. I find it a poor job description, but it may also mean that they don't really care: either you are an F#, a C#, an IronPython or a developer, they're all implicitly and secretly .NET developers.I also work on CMS like kentico,sitefinity.
I also work on MS Dynamic CRM project.