Senior Systems Administrator Engineer (Government)

Cricket Wireless LLC.; Chantilly (VA); On-site; USD 98,000 - 220,000; Full time

Benefits offered by this job

Medical/Dental/Vision coverage

401(k) plan

Tuition reimbursement program

Paid Time Off and Holidays

life and disability benefits

Job summary

AT&T Global Public Sector seeks a Senior Security Engineer to manage security operations, system administration, and compliance across Linux/Windows environments and virtualization platforms. This role requires active TS/SCI clearance with polygraph and US citizenship, with onsite work in Chantilly, VA.

You will lead security tooling, patching, vulnerability remediation, and documentation efforts while mentoring junior staff and coordinating with ISSOs/ISSMs to ensure accreditation readiness.

Qualifications

• 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.

Responsibilities

• Administer and maintain Linux-based operating systems and virtualization platforms (Red Hat, CentOS, Ubuntu, VMware, KVM, QEMU/KVM, Hyper-V).
• Support Windows server and workstation environments, including enterprise 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 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 teams.
• Produce and maintain OPS policies/instructions, CONOPS, SECOPS, and system build documents.

Skills

Security operations

Virtualization

Windows/Linux computing

Team leadership

Education

Bachelor's degree

Tools

ITSM

ServiceNow

Job description

About AT&T Global Public Sector

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 maintains active contracts and relationships with U.S. Government entities that require secure communications and systems. The operational need to add members to our support staff will continue to enable robust solutions in the IT Service and Support framework. The position supports both the active contracts as well as new contract support requests in facilitation of business capture, operations, and new technology insertion. Close relationship building with the customers ensures operational readiness and compliance. This hands‑on role is ideal for an experienced IT and security professional who will support networking, physical and virtual computing infrastructure, threat detection tools, system monitoring, incident response, and secure technology integration. In this multifaceted position, you will manage systems administration, security operations, compliance activities, and user administration in coordination with ISSOs and ISSMs. Responsibilities include system integration, configuration, deployment, remediation, and ongoing operations. This position is onsite 5 days per week at the posted location(s) only. No relocation assistance is provided.

Job Responsibilities

• 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.

Required Clearance

Top Secret/SCI with polygraph. (#ts/sci) (#polygraph)

Required Qualifications

• 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.

Desired Qualifications

• 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.

Compensation

Our Senior Security Engineer (Government) earns between $98,100 - $220,000 yearly. Individual starting salary within this range may depend on geography, experience, expertise, and education/training.

Benefits and 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

Work Schedule and Location

Weekly Hours: 40

Time Type: Regular

Location: Chantilly, Virginia

Equal Opportunity

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.

Company Overview

We are pioneers of making connections and have been ever since Alexander Graham Bell invented the telephone and founded our company. That was nearly 150 years ago, and we haven't stopped innovating since. At our core, we help bring families, communities, and businesses together with the products and services they need to thrive every day. From the widespread and growing availability of 5G and Fiber to working on things we once only dreamed of - at AT&T, we create connections that change the world.