Senior Systems Administrator - Onsite (Suitland)

AT&T; Columbia (MD); On-site; USD 89,000 - 220,000; Full time

Benefits offered by this job

Medical/Dental/Vision coverage

401(k) plan

Tuition reimbursement

Paid Time Off and Holidays

Paid Parental Leave

Caregiver Leave

Disability Benefits

Life Insurance

Employee discounts

Job summary

AT&T Global Public Sector is seeking a Senior System Administrator to support operations by maintaining, documenting, and administering enterprise IT systems. This role delivers helpdesk and troubleshooting support, oversees problem resolution, and maintains configurations to ensure availability, reliability, and security.

Office presence is required at a minimum of 5 days per week at the customer site in Suitland, MD.

Qualifications

• Eight years of relevant systems administration or infrastructure-support experience.
• Experience with 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.

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.

Skills

Incident resolution

Documentation

Change-control

Mentoring juniors

Security awareness

Education

Bachelor’s degree in IT/CS/Engineering

Tools

Windows

Linux

VMware

PowerShell

Bash

Python

Job description

AT&T Global Public Sector is seeking a Senior System Administrator to support operations by maintaining, documenting, and administering enterprise IT systems. This role delivers helpdesk and troubleshooting support, oversees problem resolution, and maintains configurations to ensure availability, reliability, and security.

Office presence is required at a minimum of 5 days per week at the customer site in Suitland, MD.