Article Writer. US writer only

I need a article writer for my new site. ***We only work with Independent writer. Only US writer required. Only serious writer required.*** Article topics : How to become a <particular profession> (only one profession.) You will become one of the core team member for this project. Requirements : 1. Article must be high quality, unique, well researched. It must cover all the topic related to keyword. 2. Article must be written in good english and good use of grammar. 3. Good knowledge of SEO because article should be seo optimized. 4. Only serious writer required. 5. Articles should not be copied, scraped or spun and has to go through [login to view URL] before the final payment is made. 6. Serious about work. Article length : 400 to 600 words 600 to 900 words 900 + words Number of articles : 10 to 60. (no. of articles increase according to project.) First i require 10 articles. Then in next phase of project (after few days) i require another almost 50 articles for this site. (all articles are related to each other. Need research on only one article rest is just little bit change.) Note : Articles should not be copied, scraped or spun and has to go through [login to view URL] before the final payment is made. Give your sample work related to this project or some other project. Good Luck. Happy bidding.