An Inno Setup developer is responsible for creating and managing installation packages for software applications. They use Inno Setup, a script-driven installation system, to design custom installers that are capable of installing, updating, and uninstalling software. They also ensure that the installers are reliable and user-friendly. The developer might also be tasked with integrating the installer with other systems or databases. They must troubleshoot any issues that arise during the installation process and ensure that the installer works across different operating systems and configurations. Their work is crucial to the smooth distribution and operation of software applications.