This position requires office presence of a minimum of 5 days per week and is only located at customer's site. 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. TAC2O (Technology Architecture for Command and Control Operations) is a five-year Task Order under the Helios IDIQ awarded to AT&T in December 2023. AT&T’s TAC2O contract provides a team of IT specialists who perform IT Engineering, Cybersecurity; Communications Security, Systems Administration, Software Development, SharePoint Development and Administration, and Program Management services supporting sensitive technical collection and exploitation missions and focused on driving optimization of performance and cost over time across multiple security domains. AT&T has an opening for a Senior System Administrator for the TAC2O program. This position will be providing managed IT support of TAC2O systems for high-priority defense intelligence collection needs.