Quality, original SEO articles needed and submission required

So, I need SEO optimized articles, 300-500 words, must ensure that all articles will be unique, high quality, perfectly grammar, copyscape and Plagiarism free. I would like to check article before you submit and show me after submission. I am going to do this for white hat SEO purpose. Looking for someone who can help me on this. I am open for a long-term relationship, 2-3 articles per month and submission. So, bid for : 1. Articles writing 2. Submit Articles All content will be almost on same topic, but need proper use of keywords density. Topic and sample will be given after initiating Private Message. Topic hints : ecommerce and magento development etc. Thank you!