Website builder / seo content writer

I need someone who is familiar with the WIX web building platform. I also need someone who can write original, grammatically correct, compelling content that keeps my websites ranking in google and other search engines (no plagiarism).. From website inception to completion and beyond. They will be working from templates, so the site is already built. I will be providing the subject matter. The writer will research the subject matter and write the content based on keywords and SEO best practices. The finished article will be submitted for approval.