A McAfee Group Shield developer is responsible for creating and maintaining the Group Shield software, a robust security solution that protects email systems from viruses, worms, spam, and other threats. They write code, debug issues, and ensure the software remains up-to-date with the latest threat definitions. Additionally, they may work on integrating Group Shield with other software or systems. Developers also troubleshoot any problems users may experience, and may work on enhancements to improve the software's performance. They typically work as part of a larger development team, and need to have strong problem-solving and programming skills.