An Agile Methodologies developer is responsible for designing, developing, and implementing software solutions using Agile principles. They collaborate with cross-functional teams to understand project requirements, break down tasks into manageable units, and deliver high-quality software in iterative cycles. They adapt to changes quickly, incorporate user feedback, and strive for continuous improvement. They also conduct regular meetings, known as sprints, to assess progress and adjust plans accordingly. Additionally, they ensure the software is tested and debugged for optimal performance. Agile developers prioritize customer satisfaction through early and continuous delivery of valuable software.