A Learning Ruby developer is in the process of mastering the Ruby programming language. They typically engage in building web applications, writing and maintaining code, debugging programs, and integrating Ruby with other languages. They are also involved in learning and implementing Ruby on Rails, a popular framework for web development in Ruby. This involves understanding the Model-View-Controller (MVC) architecture, databases, and RESTful design. They continually upgrade their skills through practice, tutorials, and coding challenges. They also collaborate with other developers, participate in code reviews, and use version control systems like Git.