A Haml developer specializes in utilizing Haml, a lightweight markup language used primarily in Ruby on Rails web development. They convert HTML code into Haml for cleaner and more efficient coding. They design web page layouts, create reusable code snippets, and integrate data from various back-end services and databases. They also troubleshoot and resolve coding issues, ensuring optimal website performance. Collaborating with other developers, they contribute to the overall structure and strategy of the project. They regularly test the website for bugs and improve its speed and performance, while adhering to best coding practices.