Senior Systems Administrator Engineer – Government

AT&T

. Administer and maintain Linux-based operating systems and virtualization platforms, such as Red Hat, CentOS, Ubuntu, VMware, KVM, QEMU/KVM, and Hyper-V .

Posted 9/25/2026full-timeChantilly • Virginia • United StatesSenior💰 $98,100 - $220,000 per yearWebsite

Tech Stack

Tools & technologies

CloudITSMLinuxServiceNowSplunkVMware

About the role

Key responsibilities & impact

Administer and maintain Linux-based operating systems and virtualization platforms, such as Red Hat, CentOS, Ubuntu, VMware, KVM, QEMU/KVM, and Hyper-V
Support Windows server and workstation environments, including standalone systems and enterprise-wide deployments
Provide multi-platform support for OEM appliances and VMware-based Windows and Linux virtual appliances
Mentor junior and mid-level team members on installation procedures, operational best practices, and security-focused administration
Install, configure, operate, and maintain security and analysis tools such as Trellix, SentinelOne, Nessus, and Splunk
Perform system patching, vulnerability remediation, and hardening activities for systems and networks
Deliver Tier 1 through Tier 3 technical support and collaborate with Tier 2 support teams as needed
Produce and maintain operational and technical documentation, including OPS policies/instructions, CONOPS, SECOPS, and system build documents
Assist with implementation, integration, and rollout of new IT solutions and technologies
Provide technical support for security compliance efforts and system accreditation processes
Support networking, physical and virtual computing infrastructure, threat detection tools, system monitoring, incident response, and secure technology integration
Coordinate systems administration, security operations, compliance activities, and user administration with ISSOs and ISSMs

Requirements

What you’ll need

Bachelor's degree and minimum 5 years of relevant experience in Security operations of systems supporting: Virtualization, Windows and Linux Computing solution engineering and architecture solutions
Experience with on-premise, cloud and hybrid-cloud based deployments
US citizenship is required
Active federal security clearance
Required Clearance: Top Secret/SCI with polygraph
Strong written and verbal communication skills
Demonstrated leader with team-oriented interpersonal skills; ability to effectively interface with a broad range of people and roles
Desired: CISSP, virtual computing certifications, (DoDD 8570/ DoDD 8140)
Experience with ITSM and/or ServiceNow
Comparable VMware certifications, RHCE, MS Certifications, Security Certifications IAT/IAM levels 1-3
Working knowledge of common operating systems (Windows, Linux, etc.) and basic endpoint security principles
Extensive experience in security operations and systems listed in the posting

Benefits

Comp & perks

Medical/Dental/Vision coverage
401(k) plan
Tuition reimbursement program
Paid Time Off and Holidays (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
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 wireline phone