An IBM MobileFirst developer designs, develops, and implements mobile applications using IBM's MobileFirst platform. They are responsible for creating the user interface, integrating with back-end services, and ensuring the application's performance and responsiveness. They use MobileFirst's advanced features for security, offline availability, and data integration. They also troubleshoot and resolve issues, and may work with other team members on deployment and continuous improvement. They need to be knowledgeable about various mobile technologies and platforms, as well as standards and best practices for mobile development. They may also need skills in specific languages such as JavaScript, , and CSS.