A Ruby on Rails Developer is an expert in using Ruby on Rails (RoR), a popular web application framework written in the Ruby programming language, to build scalable, efficient, and maintainable web applications. They specialize in developing full-stack applications, creating server-side logic, and integrating databases using Rails’ convention-over-configuration principles. Ruby on Rails Developers are skilled in front-end technologies like HTML, CSS, and JavaScript, and are experienced in using the Rails framework to streamline development processes, optimize code performance, and ensure rapid deployment. They focus on building dynamic, high-quality applications with a strong emphasis on security and scalability.