An IIS developer is responsible for managing and configuring Microsoft's Internet Information Services (IIS) . They create and maintain web applications on the IIS platform, ensuring their optimal performance. They also handle tasks related to server configuration, troubleshooting, and security. Their role includes optimizing the web server for high traffic, implementing and managing SSL certificates, and setting up load balancing. They also perform regular updates, maintain logs, and ensure the server's compliance with the latest web standards. Moreover, they collaborate with other developers to integrate web applications and services, often requiring proficiency in .NET and other Microsoft technologies.