A Ruby on Rails developer specializes in building web applications using the Ruby on Rails framework, a popular open-source framework written in Ruby. Their responsibilities typically include designing, coding, testing, and maintaining software applications.

Key Skills of a Ruby on Rails Developer:

1. Proficiency in Ruby: Strong understanding of the Ruby programming language.
2. Rails Framework Expertise: Mastery of the conventions and libraries of the Ruby on Rails framework.
3. Database Management: Familiarity with databases like PostgreSQL, MySQL, or SQLite and using ActiveRecord for object-relational mapping (ORM).
4. Front-End Knowledge: Experience with front-end technologies such as HTML, CSS, JavaScript, and frameworks like React or Vue.js.
5. Version Control: Proficiency with Git and platforms like GitHub or GitLab.
6. APIs: Ability to create and integrate RESTful APIs and sometimes GraphQL.
7. Testing: Knowledge of testing frameworks like RSpec, Capybara, or Minitest.
8. Deployment: Familiarity with deployment tools and environments like Heroku, AWS, or Docker.
9. Agile Methodologies: Understanding of agile development practices like Scrum or Kanban.
10. Problem-Solving Skills: Ability to debug and solve complex problems efficiently.

Typical Responsibilities:

• Develop and maintain web applications.
• Write clean, maintainable, and efficient code.
• Collaborate with front-end developers, designers, and stakeholders.
• Test applications for performance and security.
• Optimize applications for scalability and responsiveness.
• Participate in code reviews and ensure adherence to best practices.
• Manage databases and integrate third-party services or APIs.