Job Description: 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 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. Job Duties/Responsibilities: * Plans, designs, and implements infrastructure changes and system upgrades. * Manages and troubleshoots multiple VMware environments. * Provides Windows Server and Linux administration, maintenance, and troubleshooting. * Creates STIG compliant images for Windows Desktop, Windows Server, and Linux OS. * Creates, tests, and deploys software packages using software deployment products such as SCCM, PDQ, etc. * Provides expert level support and mentoring for Mid and Junior System Administrator personnel. * Develops and maintains installation and configuration procedures for system and software changes. * Utilizes scripting to automate common tasks. * Performs hardware maintenance/repair activities. * Ensures proper planning and execution of major projects/maintenance activities. * Provides advanced level administration and troubleshooting of Active Directory, GPO, DNS, DHCP, and Domain Controllers. Required Clearance: TS SCI with poly (#tssci) (#polygraph) Required Qualifications: * Ability to write scripts using PowerShell and/or Bash. * Experience managing VMware, Nutanix, and other types of enterprise level Virtual Infrastructures. * Proficient in managing and troubleshooting Active Directory and Group Policy Object (GPO). * At least 8 years of relevant experience. * Must presently be 8570 compliant (IAT Level 2 preferred); must be 8570 compliant (IAT Level 2) by date of security indoctrination with any necessary continuing education (CE) for certification. Desired Qualifications: * Linux OS (CentOS, RHEL) administration. * Satellite server administration. * Ansible playbook writing. * Implementing STIGs. * Experience supporting a software configuration management and development environment. Our Senior System Administrator's earn between $130,000-$196,000. Not to mention all the other amazing rewards that working at AT&T offers. Individual starting salary within this range may depend on geography, experience, expertise, and education/training. Joining our team comes with amazing perks and benefits: * Medical/Dental/Vision coverage * 401(k) plan * Tuition reimbursement program * Paid Time Off and Holidays (based on date of hire, at least 23 days of vacation each year and 9 company-designated holidays) * Paid Parental Leave * Paid Caregiver Leave * Additional sick leave beyond what state and local law require may be available but is unprotected * Adoption Reimbursement * Disability Benefits (short term and long term) * Life and Accidental Death Insurance * Supplemental benefit programs: critical illness/accident hospital indemnity/group legal * Employee Assistance Programs (EAP) * Extensive employee wellness programs * Employee discounts up to 50% off on eligible AT&T mobility plans and accessories, AT&T internet (and fiber where available) and AT&T phone Weekly Hours: 40 Time Type: Regular Location: Reston, Virginia It is the policy of AT&T to provide equal employment opportunity (EEO) to all persons regardless of age, color, national origin, citizenship status, physical or mental disability, race, religion, creed, gender, sex, sexual orientation, gender identity and/or expression, genetic information, marital status, status with regard to public assistance, veteran status, or any other characteristic protected by federal, state or local law. In addition, AT&T will provide reasonable accommodations for qualified individuals with disabilities. AT&T is a fair chance employer and does not initiate a background check until an offer is made. Job ID R-65032 Date posted 04/23/2025 Apply now Save role