Curious - other than Stack Overflow and obviously Microsoft, what other well known tech companies use .NET as their primary stack?

In any case, before I removed mention of C#/.NET on my profile and resume, I would be bombarded with recruiter e-mails and phone calls advertising jobs at old school cost center companies, most of them paying very poorly too.

After removing C#/.NET, these have gradually declined, and nowadays any recruiter that contacts me is for a job/company that I would generally be more interested in.