A technical writer (also called a technical communicator) is a professional writer who designs, creates, and maintains technical documentation. This documentation includes online help, user guides, white papers, design specifications, system manuals, and other documents.
Engineers, scientists, and other professionals may also produce technical writing, usually handing their work to a professional technical writer for proofreading, editing, and formatting. A technical writer produces technical documentation for technical, business, and consumer audiences. ~ Wikipedia