An IIS/Hosting Environments developer primarily manages and configures Microsoft's Internet Information Services (IIS), a web server used to host websites and other web applications. They ensure seamless functioning of the hosting environment, including setting up, configuring, securing, and optimizing servers. Their duties include installing and updating server software, troubleshooting issues, maintaining network infrastructure, and implementing security measures. They also monitor server performance, conduct regular tests for network weakness, and develop backup and recovery procedures. They work closely with developers to deploy and optimize web applications, and may also help design and implement web architecture.