A Highchart developer specializes in using the Highcharts JS library to create interactive charts for websites and applications. They transform complex data into visually engaging, user-friendly graphical representations like line, pie, bar, and scatter plots, among others. The developer ensures the charts are responsive and compatible across various devices and browsers. They also integrate the charts with data sources and update them in real-time. Their role involves collaborating with data analysts and UI/UX designers to optimize data visualization, improving user understanding and interaction. They may also troubleshoot issues and enhance the functionalities of Highcharts as required.