Hey Fasa,
Linkbuilding isn't my thing. In fact, finding somebody that is truly an expert is highly unlikely to excel in both copywriting AND linkbuilding.
With that said, my specialty is copywriting. I know how to build articles and sales pages that the search engines like. More importantly, I know how to write things that turn your traffic into paying customers.
I can prove (with real numbers) that my writing is better than anything you're likely to find on Freelancer. But to work with me, you'd have to find an SEO expert to handle the linkbuilding and onsite stuff.
If it's worth having a conversation, let me know. Either way, good luck on your project.