This position requires office presence of a minimum of 5 days per week and is only located at customer's site. No relocation is offered. AT&T Global Public Sector is a trusted provider of secure, IP enabled, cloud-based, network solutions and professional services to the Federal Government. We are dedicated to recruiting, developing and empowering a diverse, high-performing workforce that is passionate about what they do, committed to our shared values and dedicated to our customers’ mission. AT&T is hiring to support a US Government Program that provides IT Services to US Strategic Command located in Omaha Nebraska. Job Duties/Responsibilities: Perform systems administration for enterprise Omnissa (Horizon VDI) solutions, including installation, configuration, and maintenance. Analyze and resolve issues related to servers, hardware, applications, and software within the Omnissa environment. Monitor system performance and ensure compliance with security standards and organizational policies. Oversee daily system operations, evaluate server resource availability, and manage all Omnissa software activities. Assist in configuring, deploying, and maintaining virtual machines and backup configuration procedures. Maintain and monitor patch releases, design and implement patch installation strategies, and ensure systems are updated per program standards. Provide Tier 2 and Tier 3 troubleshooting support, working with end users and technical teams to resolve complex issues. Support the creation, updating, and maintenance of images for VDI terminals, including application support and baseline management. Ensure VMware backend capacity and stability to support virtual desktops and overall VDI infrastructure. Maintain documentation and adhere to best practices for system administration and service support. Perform shift work to provide continuous 7x24 coverage.