I don't think this is precisely the example you're looking for, but this is what I know of design companies. I have a degree in business and finances. I also have a business that didn't have a lot of buyers at a time. I needed a site design, but I can't do that. So somebody else had to do it for me. That somebody else was
https://www.cubycode.com. They made my ugly site look friendly, clean, and professional. Above all, it was easy to use, and the logo got popular in no time. I did have to pay a lot, but it was totally worth it.