Senior Trellix Security Engineer - TS/SCI, On-Site DC

Eliassen Group; Washington (District of Columbia); On-site; USD 140,000 - 170,000; Full time

Job summary

On-site in Washington, DC, Eliassen Group is seeking a Sr. Security Engineer (Trellix) to serve as the technical lead for the client's endpoint security and data protection ecosystem.

You will balance day-to-day operational support with strategic cybersecurity engineering initiatives while partnering with security operations, infrastructure, application teams, and leadership to strengthen the overall security posture.

Qualifications

• Active TS/SCI security clearance.
• 5+ years administering and engineering Trellix solutions in a large enterprise.
• Hands-on expertise with Trellix ePO, ENS, EDR, DLP, Drive Encryption (FRP/FRMP), TIE, DXL, Policy Auditor, Rogue System Detection, TSME, Solidcore, and FIM.
• Experience with application whitelisting, endpoint hardening, encryption, and data protection.
• Integration experience with SIEM, SOAR, threat intelligence, and identity platforms.
• Strong understanding of endpoint security architecture, threat detection, incident response, and risk management.
• Experience developing DLP policies, device control, and data exfiltration prevention.
• Experience supporting SOCs and enhancing 24x7 monitoring and response.
• Nice to have: CNSSD 504, NIST standards, automation with PowerShell/Python/REST APIs, dashboards and federal assessment support.

Responsibilities

• Lead engineering and administration of Trellix security platforms, including ePO, ENS, EDR, DLP, Drive Encryption (FRP/FRMP), TIE, DXL, Policy Auditor, Rogue System Detection, Trellix Security for Microsoft Exchange (TSME), Application and Change Control (Solidcore), and File Integrity Monitoring (FIM).
• Implement and manage application whitelisting, endpoint hardening, encryption, and data protection technologies.
• Integrate endpoint security with SIEM, SOAR, threat intelligence, and identity management solutions.
• Develop and maintain DLP policies, device control mechanisms, and data exfiltration prevention controls.
• Support SOC operations and enhance 24x7 monitoring and incident response capabilities.
• Create and maintain security engineering standards, SOPs, playbooks, and operational procedures.
• Support compliance initiatives aligned to federal cybersecurity frameworks and regulations.
• Perform analytical troubleshooting and root-cause analysis to improve platform reliability and security outcomes.

Skills

Active TS/SCI clearance

Trellix

ePO

EDR

DLP

SIEM

SOAR

Threat intelligence

Tools

Trellix ePO

Trellix ENS

Trellix EDR

Trellix DLP

Drive Encryption FRP/FRMP

Trellix TIE

Trellix DXL

Policy Auditor

Rogue System Detection

TSME

Solidcore FIM

Job description

On-site in Washington, DC, Eliassen Group is seeking a Sr. Security Engineer (Trellix) to serve as the technical lead for the client's endpoint security and data protection ecosystem.

You will balance day-to-day operational support with strategic cybersecurity engineering initiatives while partnering with security operations, infrastructure, application teams, and leadership to strengthen the overall security posture.