An Infrastructure Developer, especially one with Microsoft Certified Systems Engineer (MCSE) certification, designs, manages, and oversees the implementation of Microsoft-based IT infrastructure systems. They ensure the stability, integrity, and efficient operation of the information systems that support core organizational functions. This typically involves developing, configuring, maintaining, supporting, and optimizing everything from servers and network protocols to databases and software applications. They also troubleshoot problems, coordinate with other teams for integration, and ensure security and data protection. Their role is crucial for businesses to have a robust, efficient, and secure IT infrastructure.