Senior Systems Administrator (Government)

This position requires office presence of a minimum of 5 days per week and is only located at customer's site. Actual work location will be Suitland, MD 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 to support operations by maintaining, documenting, and administering enterprise IT systems. This role is the Senior System Administrator will deliver helpdesk and troubleshooting support, oversee problem resolution, and maintain system configurations to ensure availability, reliability, and security.

Job Duties/Responsibilities:

• Install, configure, administer, monitor, patch, upgrade, and maintain enterprise systems.
• Support Windows, Red Hat Linux, Trusted Linux, VMware, applications, endpoints, and related infrastructure.
• Troubleshoot complex hardware, software, access, performance, connectivity, and availability issues.
• Perform root-cause analysis and implement authorized corrective actions.
• Administer user accounts, permissions, and access controls.
• Support backups, restoration, recovery testing, and continuity procedures.
• Implement approved security patches, configuration changes, and vulnerability remediation.
• Monitor system health, capacity, performance, services, logs, and storage utilization.
• Maintain system documentation, SOPs, technical manuals, work logs, configuration records, and help-desk tickets.
• Support configuration management, change control, system testing, deployment, sustainment, modernization, and decommissioning.
• Coordinate with cybersecurity, network, database, software, systems engineering, and government teams.
• Provide technical guidance and mentoring to junior administrators.
• Comply with classified-information handling, Information Assurance, access-control, and customer-security requirements.

Clearance Requirements:

Active TS w/SCI Eligibility with poly (#tssci) (#polygraph)

Required Qualifications:

• Bachelor's degree in information technology, computer science, engineering, or a related field.
• Eight years of relevant systems administration or infrastructure-support experience.
• Experience supporting Windows, Linux, VMware, enterprise applications, hardware, and software.
• Experience with incident resolution, system maintenance, technical documentation, and change-control processes.
• Ability to obtain and maintain required security clearance, access eligibility, and customer approvals.

Desired Qualifications:

• Security+ or relevant certification.
• Experience supporting classified, secure, disconnected, or restricted environments.
• Experience with PowerShell, Bash, Python, or other system-administration automation.
• Experience with vulnerability remediation, system hardening, monitoring, backup, and recovery.

Our Senior System Administrator's earn between $89,200 - $220,480. 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 w available) and AT&T wireline phone

Weekly Hours:

40

Time Type:

Regular Location:

Columbia, Maryland AT&T and its subsidiaries are committed to equal employment opportunity. All hiring, promotion, and other employment decisions remain merit-based and free from discrimination on the basis of race, color, religion, religious creed, national origin, ancestry, age, sex, sexual orientation, gender, gender identity, gender expression, physical disability, mental disability, pregnancy, medical condition, genetic information, marital status, citizenship status, military status, veteran status, or any other characteristic protected by federal, state, or local laws. In addition, AT&T will provide reasonable accommodations to qualified individuals with disabilities. AT&T is a fair chance employer and does not initiate a background check until an offer is made. to learn more or request an application accommodation . Job

ID R-122048

Date posted 09/08/2026