Article Writing Project - Test

Looking for SEO contract copywriter to do 10 SEO'd articles on a monthly basis on wide variety of topics for soon to launch consumer portal. Willing to pay premium for professionally written, US English, SEO content. Articles need to be a minimum of 500-700 words and need to use standard benchmarked SEO principles, including proper keyword densities, keyword prominence, and keyword distribution in all of the articles. Companies that do not utilize writers who speak and write English as native language, please do not bid.