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.

AT&T has an opening for a Sr. System Administrator for the TAC2O program. This position will be providing managed IT support of TAC2O systems for high-priority defense intelligence collection needs. 

The job duties of the Sr. System Administrator are as follows:  

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 advanced level administration and troubleshooting of Active Directory, GPO, DNS, DHCP, and Domain Controllers.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.

Required Clearance:

TS/SCI with poly (#tssci) (#polygraph)

Required Qualifications:

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.Experience with multi-level security domains.Experience with networks containing Cross Domain and multi-level security appliancesMust 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.Ability to write scripts using PowerShell and/or Bash.

Desired Qualifications:

Satellite server administration.Ansible playbook writing.Implementing STIGs.Experience supporting software configuration management and development environment.Linux OS (RHEL) administrationExperience with Windows OS Administration

Our Senior System Administrator's earn between $89,200 - $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 coverage401(k) planTuition reimbursement programPaid Time Off and Holidays (based on date of hire, at least 23 days of vacation each year and 9 company-designated holidays)Paid Parental LeavePaid Caregiver LeaveAdditional sick leave beyond what state and local law require may be available but is unprotectedAdoption ReimbursementDisability Benefits (short term and long term)Life and Accidental Death InsuranceSupplemental benefit programs: critical illness/accident hospital indemnity/group legalEmployee Assistance Programs (EAP)Extensive employee wellness programsEmployee 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

Salary Range:

$89,200.00 - $207,900.00

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-102438 Date posted 02/25/2026