A BufferApp developer is responsible for designing, building, and maintaining the BufferApp, a social media management tool. They handle backend and frontend development tasks, including creating user-friendly interfaces, implementing features for scheduling and analyzing social media posts, and ensuring the app's performance and stability. They collaborate with other team members, like UX designers and data scientists, to improve user experience. They also troubleshoot issues, fix bugs, and respond to user feedback to enhance the app's functionality. Their role requires proficiency in various programming languages and an understanding of social media platforms' APIs. They ensure the app remains up-to-date with social media trends and changes.