An ArgoUML developer is responsible for creating, maintaining, and improving software applications using ArgoUML, an open-source UML modeling tool. They design and develop software systems by understanding user requirements, creating UML diagrams like class, object, use case, sequence, and activity diagrams. These diagrams help in visualizing and constructing software systems. ArgoUML developers also debug and fix issues, ensuring the software is free from errors. They collaborate with other software developers, system architects, and stakeholders to ensure the software aligns with the desired specifications. Additionally, they may also carry out software testing to verify the software's functionality.