The job responsibilities of a content writer include the following: 1. Writing web content for websites and portals. 2. Writing, editing, and proofreading copy for clients based on research and background information supplied to them. 3. Developing high-quality content including articles, case studies and blog content for a company's website and blog. 4. Checking and re-checking the content on a website for typos and grammatical errors before making them LIVE. 5. Writing content for online magazines and newsletters. 6. Writing informational content for a company's products.