A Cognos Report Studio developer creates, manages, and distributes professional reports using IBM's Cognos Report Studio (.x and ). They design report layouts, add data, and enhance the presentation with charts, images, and conditional formatting. They also define complex report queries, create prompts for user interaction, and build calculated and summarized data elements. Additionally, they ensure data accuracy, optimize report performance, and implement security settings. They also troubleshoot issues, provide technical support, and may train end-users. They work closely with business analysts and stakeholders to understand reporting requirements and deliver customized business intelligence solutions.