Honestly, any UNIX shop nowadays is very likely to be primarily Linux, if 
not exclusively so.

With that said, what you run on your servers and what your DESKTOPS run 
are different question. If your corporate infrastructure is built around 
Outlook/Office, you're very likely going to be running Windows on your 
desktop. Different companies will have different levels of allowing you to 
have Linux machines in addition or instead of that.

And you're not going to get anyone's desktop infrastructure from a job 
listing.

On Thu, 14 Jun 2018, Christopher Pearson wrote:

> Are there any employers in town, or offering remote, where the
> majority of some group it's hiring for run Linux natively (not in a VM
> under Mac/Win?)
>
> Merely filtering out employers on job boards and Linked-in has proven
> to be harder
> than expected.  Mac and Win have much more market share in engineering
> than expected despite their servers and products usually running Linux.
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