A Fusion Charts developer specializes in creating interactive and visually appealing charts, graphs, and other data visualization tools using FusionCharts, a JavaScript charting library. They design and implement user-friendly interfaces to represent complex data in an understandable manner. Their responsibilities include integrating FusionCharts into various web applications, debugging and fixing issues, and ensuring optimal performance across different browsers and platforms. They also collaborate with other team members to understand data requirements and transform them into effective visualizations. The developer often needs to stay updated with the latest trends in data visualization and web development technologies.