Cybersecurity Jobs in Warrenton, VA

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Senior Information System Security Engineer

Amentum Warrenton, VA

Warrenton, VA

Today

$145k - $165k/yr Full time Senior Cybersecurity Tools Endpoint Security

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Job Description

This senior information system security engineer role focuses on leading Trellix (ePO) and ACAS (Nessus) toolsets, providing RMF and ATO support, and applying secure-by-design principles across the SDLC for mission-critical assets at Amentum in Warrenton, Virginia. The position is onsite and requires close collaboration with cross-functional teams to safeguard information systems.

Responsibilities

Ecosystem Management: Design, configure, and maintain Trellix components (ePO, Trellix Agent, DLP, HIPS, Policy Auditor, ABM, VSE) across Windows and Linux environments.
Policy Development: Create and deploy endpoint security policies for ENS modules (Threat Prevention, Firewall, Web Control) aligned with DISA STIGs and organizational needs.
Threat Mitigation: Develop custom signatures, rules, and exceptions to address zero-day threats and operational requirements.
Operational Continuity: Validate custom exceptions to ensure uninterrupted operation of mission-critical processes while maintaining compliance.
Architecture & Strategy: Design enterprise-wide vulnerability scanning strategies and oversee deployment of Security Centers and Nessus scanners.
Advanced Troubleshooting: Serve as the final escalation point for complex scan issues, credentialing problems, and system communication failures.
Risk Reporting: Configure automated reporting of compliance data to continuous monitoring systems and risk-scoring repositories.
Tool Orchestration: Integrate Trellix and ACAS with Splunk, XSOAR, and ServiceNow to automate workflows and strengthen incident response.
RMF Support: Provide authoritative recommendations and ACAS-generated artifacts to support Assessment and Authorization processes and RMF packages for ATO.
Strategic Oversight: Maintain and scale test, development, and production environments, collaborating with Network and DevSecOps teams to improve resilience.
Multi-Tier Support: Deliver Tier 1–3 maintenance and incident response for the full cybersecurity portfolio including ACAS, Trellix, Splunk, and XSOAR.
Compliance Mastery: Maintain deep understanding of DISA STIGs, NIST 800-53, and the RMF guidelines.

Requirements

Active Top-Secret clearance with SCI or TS eligibility to obtain SCI.
Experience with Nessus/ACAS and Trellix administration.
Experience in a Splunk role within a Splunk Clustered Environment.
Minimum 8 years of relevant experience.
Availability for a 40-hour work week, typically Monday through Friday, with overtime during critical periods as needed.
Travel availability of 5–10 percent, primarily within 75 miles.
Proficiency with MS Office applications: Excel, Word, Outlook, SharePoint, Project, Visio.
Excellent attention to detail, strong verbal and written communication, and solid analytical and organizational abilities.
Ability to work independently and as part of a team in a dynamic environment.

Technologies

Trellix (ePO), Trellix Agent, DLP, HIPS, Policy Auditor, ABM, VSE
Nessus, ACAS
Splunk, XSOAR, ServiceNow
Windows, Linux
MS Office Suite: Excel, Word, Outlook, SharePoint, Project, Visio

Benefits

401(k)
401(k) matching
Dental insurance
Employee assistance program
Employee discount
Flexible schedule
Flexible spending account
Health insurance
Health savings account
Life insurance
Paid time off
Parental leave
Professional development assistance
Referral program
Retirement plan
Tuition reimbursement
Vision insurance

Other Responsibilities

Safety - Amentum maintains a safety culture; all employees are responsible for a safe work environment, completing required training, and participating in emergency tasks as applicable.
Quality - Adhere to the Amentum Quality Policy and related quality systems to meet customer expectations and conform to contracts.
Procedure Compliance - Read, understand, and implement general and specific operational, safety, quality, and environmental requirements of all plans, procedures, and policies relevant to the role.

Education

Bachelor's degree in Cyber and/or Engineering is required.

Experience

Trellix Administration: 5 years (Required)
Splunk: 6 years (Required)
ACAS/Nessus: 8 years (Required)

Licenses and Certifications

TS/SCI (Required)
IAT Level II (Required)

Location

Warrenton, VA 20186 (Onsite, in person).

Travel Requirements

5 to 10 percent travel, primarily within 75 miles.

Work Location

In person

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