A Rails Developer specializes in building and maintaining applications using Ruby on Rails. Their role is crucial in delivering scalable, high-performance web solutions. Key responsibilities include designing applications, writing clean code, conducting testing, and troubleshooting issues. Required skills encompass proficiency in Ruby, Rails, HTML, CSS, JavaScript, and database management. Typically working in collaborative environments, they liaise with designers, product managers, and QA engineers. Career progression can lead to roles such as Senior Developer, Lead Engineer, or Software Architect, with opportunities for specialization in areas like DevOps or cloud computing.