SEO for different Languages

Hello there BHW,

I have a website with subdomains in various different languages for example:

it.example.com (italian)
gr.example.com (greek)
fr.example.com (french)

I am looking for a reputable SEO company to build backlinks and high quality blog posts in the respective languages and preferably on websites that are in those particular languages and domains.

Anyone know of a one stop SEO shop for all or most languages?

Thanks in advance!

Don't know if you should better post on the Hire a Freelancer section