Streaming 4K content

I'm building a channel and want to stream 4K content. I'm running into issues and don't want to reinvent the wheel.

Is there a guide or example on how Netflix does it? Do they actually use HLS or some other (MP4)?

I'm currently using ffmpeg to generate the HLS files but is there a better alternative such as Wowza?

If you have experience getting this type of channel up and running I am willing to pay a consulting fee to help get it set up and running.