Systems Administrator II; Government

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Job Description:

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.

Our National Security Team supports the intelligence community by providing, operating and assuring critical voice, video and collaboration services for the full spectrum of operations.

AT&T has an opening to support the Intelligence Sector for a System Administrator to provide comprehensive support to all aspects of system maintenance, from daily troubleshooting needs to the verification of system performance.

• Administer and troubleshoot Linux and Windows servers in AWS Gov Cloud and manage on‑prem HP thin clients, including maintaining gold images and deploying updates.
• Administer VMware infrastructure (vCenter/vSphere/ESXi), including provisioning, configuration, performance monitoring, and lifecycle management of virtual machines.
• Perform patching, OS updates, and configuration reviews using Ansible Automation Platform; apply DISA STIGs and other hardening standards to maintain compliance.
• Monitor system performance, resource utilization, and capacity to ensure availability and support lifecycle planning.

• Manage Active Directory forests, domains, and OUs, including users, groups, and hardware objects (thin clients, servers, VMs), GPOs, and access controls.
• Perform account provisioning, deprovisioning, and periodic access reviews in accordance with ICAM standards.
• Administer enterprise ICAM and PKI/PKE services, including certificate issuance, renewal, and authentication integration.

• Manage backup and recovery solutions in line with Business Continuity and Disaster Recovery (BCDR) requirements.
• Support Asset Management by automating the reporting of assets, ensuring accurate system inventories for audits, compliance, and lifecycle management.
• Support security audits and vulnerability assessments by providing system data, implementing remediation actions, and maintaining audit‑ready configurations.
• Execute system changes and upgrades in accordance with program change and configuration management processes.

• Provide Tier 2 incident response by troubleshooting escalated issues, restoring service, and escalating to Tier 3 as needed.
• Directly assist end users and mission partners with escalated system issues requiring administrative intervention.
• Collaborate with cloud, security, and network engineers to support enterprise services while maintaining clear system administration scope.
• Develop and maintain system documentation, including SOPs, baseline configurations, and technical knowledge articles.

TS/SCI with polygraph.

• Candidate must have 10 years of experience (e.g., 6 years’ Systems Administration experience or equivalent educational background).
• Maintain DoD 8570/8140 IAT Level II or III certification.
• Must be able to support on‑call, after‑hours, and weekend support.

• Experience working in DoD or Intelligence Community (IC) environments, with an understanding of audit and compliance requirements.
• Familiarity with change and configuration management processes (e.g., ITIL, CAB).
• Experience supporting asset management automation for accurate system reporting and compliance tracking.
• Vendor certifications such as:
• VMware Certified Professional (VCP)
• Red Hat Certified System Administrator/Engineer (RHCSA/RHCE)
• Microsoft Certified:
  Windows Server Administration/Engineer
• Experience with zero‑trust security models and integrating system administration tasks into enterprise cybersecurity frameworks.
• Familiarity with enterprise backup solutions, particularly Commvault, in large‑scale mission…