A Birt Reporting Developer is responsible for creating, designing, and maintaining reports using Birt, an open-source technology used for data visualization and reporting. Their duties include understanding business requirements, translating them into report designs, creating complex queries for data extraction, and integrating these reports into applications. They also troubleshoot issues, optimize performance, and ensure data accuracy. Additionally, they might work closely with other team members, like data analysts or business intelligence professionals, to provide insightful data visualizations. They need to have strong SQL skills, knowledge of Java or JavaScript, and an understanding of database concepts.