A Jasper Reports developer designs and creates dynamic reports, charts, and dashboards using JasperReports library. They extract data from various sources like SQL, XML, or Java objects, and present it in a structured and readable format. They customize reports using scripting languages like Groovy or JavaScript. They integrate JasperReports into Java applications or web applications to provide real-time reporting solutions. They also maintain and troubleshoot the reports, ensuring data accuracy and optimizing performance. Additionally, they may work closely with business analysts or clients to understand reporting requirements and translate them into technical solutions.