Sr. Trellix Cybersecurity Engineer

Seeking a Senior Trellix Cybersecurity Engineer with RMF ISSO expertise

to architect, implement, and manage a comprehensive Trellix security

environment while supporting RMF compliance activities.

This role requires expertise in deploying / utilizing Trellix ,

configuring and managing all modules, performing STIG compliance across

integrated devices including Microsoft SQL, and ensuring cybersecurity

compliance through direct ISSO responsibilities. The candidate will

support various infrastructure environments to ensure their security

posture meets DoD and IC mission objectives.

This is a full-time permanent on-site role in Chantilly, VA.

Primary Responsibilities:

• Install, configure, and manage Trellix ePO and associated modules

from initial deployment to operational sustainment.

• Integrate Trellix with Microsoft SQL databases, ensuring optimal

performance, availability, and security compliance.

• Develop and implement STIG hardening for all systems associated with

Trellix deployment, including endpoints, servers, and databases.

• Configure and manage endpoint security, DLP, threat prevention, and

advanced Trellix modules to support CDAO AI/ML mission security

requirements.

• Conduct vulnerability assessments and remediate findings to maintain

system compliance with DoD and CDAO security standards.

• Develop operational documentation, SOPs, and as-built configurations

for sustainment.

• Collaborate with security teams, system administrators, and data

engineers to integrate Trellix into AI/ML workflows securely.

• Provide Tier III support and subject matter expertise for all

Trellix-related issues and projects.

Additional Duties - RMF ISSO Roles & Responsibilities:

• Serve as Information System Security Officer (ISSO) for assigned

systems.

• Support development, implementation, and maintenance of RMF

packages, including System Security Plans (SSPs), Security

Assessment Reports (SARs), and Plans of Action and Milestones

(POA&Ms).

• Conduct continuous monitoring activities, vulnerability scanning,

and security control assessments.

• Coordinate with the Information System Security Manager (ISSM) and

Authorizing Official (AO) to maintain system Authorization to

Operate (ATO) status.

• Ensure security requirements are integrated into system designs

supporting operations.

• Maintain knowledge of evolving DoD, RMF, and CDAO cybersecurity

policies to ensure compliance and proactive risk management.

Eligibility: Candidate must possess an active TS/SCI with CI Polygraph, 8+ years of cybersecurity engineering experience, with significant

hands-on expertise inTrellix(McAfee) architecture and

administration.

• Bachelor's Degree in Computer Science, Cybersecurity, or related

field.

• Active TS/SCI Clearance required.

• 8570 IAT II compliant certification (e.g., Security+, CCNA Security,

CySA+, GICSP, GSEC, SSCP).

• Cloud Security Certification (e.g., AWS Certified Security -

Specialty, CCSK, CCSP, Azure Security Engineer Associate) Desired.

• Expert-level knowledge in deploying and managing Trellix ePO, Threat

Prevention, DLP, and associated modules in DoD environments.

• Demonstrated experience setting up Trellix from scratch, including

policy configuration, system deployment, and integration with

Microsoft SQL databases.

• Strong understanding of DoD STIG compliance, vulnerability

management, and security hardening for Windows and Linux systems.

• Experience performing RMF ISSO responsibilities within classified

environments.

• Strong communication and collaboration skills, with experience

working in cross-functional mission-focused teams.

• U.S. Citizenship required due to contract requirements.

Preferred Qualifications:

• Trellix/McAfee Certified Product Specialist or similar vendor

certifications.

• Familiarity with SIEM integrations involving Trellix and enterprise

logging solutions.

• Experience with STIG compliance automation tools (e.g., SCAP, DISA

STIG Viewer).

• Ability to develop security engineering solutions in alignment with

RMF, NIST, and DoD cybersecurity frameworks.

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