Senior Security Engineer – Government

AT&T

Senior Security Engineer supporting secure IT operations for the Federal Government. Handling systems administration, threat detection, incident response, and secure technology integration.

Posted 5/29/2026full-timeChantilly • Virginia • 🇺🇸 United StatesSenior💰 $98,100 - $220,000 per yearWebsite

Tech Stack

Tools & technologies

CloudITSMLinuxServiceNowSplunkTypeScriptVMware

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, 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 the implementation, integration, and rollout of new IT solutions and technologies.
Provide technical support for security compliance efforts and system accreditation processes.

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.
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.
Active Cleared Individual clearance supporting the overall business up to TS/SCI with polygraph.
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 (based on date of hire, at least 23 days of vacation each year and 9 company-designated holidays) *Pro-rated when working less than 40 hrs/wk.
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 wireline phone

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

LinuxWindows ServerVMwareKVMQEMUHyper-VSecurity OperationsSystem PatchingVulnerability RemediationTechnical Documentation

Soft Skills

Written CommunicationVerbal CommunicationTeam LeadershipInterpersonal SkillsMentoring

Certifications

CISSPRHCEMS CertificationsSecurity Certifications IAT/IAM levels 1-3Virtual Computing Certifications