A HbbTV (Hybrid Broadcast Broadband TV) developer designs and creates applications for digital television platforms, combining traditional TV signals with broadband internet. They work on integrating various web technologies like HTML, CSS, and JavaScript with broadcasted content, ensuring seamless interaction between the two. They handle the production of interactive content, such as on-demand video services, personalized advertising, or interactive gaming. Additionally, they ensure that applications comply with HbbTV standards and work efficiently across different devices. They also troubleshoot issues, optimize performance, and may collaborate with other teams to enhance viewer experience.