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Sr. Security Engineer (Trellix)

Eliassen Group

Washington, DC • 10/14/2026

Engineering , Professional , Security & Law Enforcement

Job Description

Job Description
Description:

On-site in Washington, DC

As a Sr. Security Engineer (Trellix), you will serve as the technical lead for our 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.

Due to federal security clearance requirements, applicant must be a United States Citizen with an active Top Secret clearance. This is a full-time, permanent opportunity, offering a competitive salary and comprehensive benefits package. Qualified applicants must be willing and able to work on a w2 basis.

Salary: $130,000 - $170,000/ yr. w2

Responsibilities:
  • Serve as technical lead for Trellix endpoint security and data protection capabilities across a large enterprise.
  • Administer and engineer Trellix 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 platforms 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 threat monitoring and incident response capabilities.
  • Develop security engineering standards, SOPs, playbooks, and operational procedures.
  • Support compliance initiatives and implement security controls aligned to federal cybersecurity frameworks and regulations.
  • Perform analytical troubleshooting and root-cause analysis for endpoint security issues.
  • Collaborate with security operations, infrastructure, application teams, and leadership to strengthen security posture.
Experience Requirements:
  • Active TS/SCI security clearance.
  • 5+ years of experience administering and engineering Trellix security solutions in a large enterprise environment.
  • Hands-on experience with Trellix ePO, ENS, EDR, DLP, Drive Encryption (FRP/FRMP), TIE, DXL, Policy Auditor, Rogue System Detection, TSME, Application and Change Control (Solidcore), and FIM.
  • Experience implementing and managing application whitelisting, endpoint hardening, encryption, and data protection technologies; integrating endpoint security platforms with SIEM, SOAR, threat intelligence, and identity management solutions.
  • Strong understanding of endpoint security architecture, cyber threat detection, incident response, and risk management principles; experience developing and maintaining DLP policies, device control, and data exfiltration prevention controls.
  • Experience supporting SOCs and enhancing 24x7 threat monitoring and response capabilities; ability to develop engineering standards, SOPs, playbooks, and operational procedures.
  • Experience supporting compliance initiatives aligned with federal cybersecurity frameworks and regulations; strong analytical, troubleshooting, and root-cause analysis skills.
  • Nice to Haves: Experience with Insider Risk, Data Protection, or UAM programs; knowledge of CNSSD 504, NIST 800-53, NIST 800-207, and NIST CSF; automation using PowerShell, Python, or REST APIs; integrating Trellix telemetry with SIEM and SOAR; executive dashboards and metrics; FIM for compliance and forensics; JCIP or FISMA support; familiarity with threat-informed defense and automation frameworks; relevant Trellix, cybersecurity, or cloud security certifications.
Recruitment Transparency Notice
Eliassen Group values transparency in our recruitment practices. Please be advised that Eliassen Group utilizes artificial intelligence (AI) tools as part of its initial application screeningand hiringprocess. You may receive email and SMS notifications from the Eliassen Virtual Recruiting Team (, ) inviting you to complete a brief voice screening as part of your application process. These tools assist our hiring teams in different ways, including but not limited to, assistance in reviewing application materials to help identify candidates whose qualifications most closely match the requirements of the position. All AI-assisted evaluations and responses are reviewed by human recruiters before any hiring decisions are made. The use of AI in our process is intended to support fairness, efficiency, and consistency, and Eliassen Group takes measures to prevent bias or discrimination in connection with its hiring practices. By proceeding, you acknowledge, agree, and consent to Eliassen Group’s use of these tools, including AI tools, as part of the application and hiring process.

Skills, experience, and other compensable factors will be considered when determining pay rate. The pay range provided in this posting reflects a W2 hourly rate; other employment options may be available that may result in pay outside of the provided range.W2 employees of Eliassen Group who are regularly scheduled to work 30 or more hours per week are eligible for the following benefits: medical (choice of 3 plans), dental, vision, pre-tax accounts, other voluntary benefits including life and disability insurance, 401(k) with match, and sick time if required by law in the worked-in state/locality.If anyone reaches out to you about an open position connected with Eliassen Group, please ensure that you are working directly with us by confirming the following:

· When you work with Eliassen Group, all email communication will come from an Eliassen.com address, never Gmail, Yahoo, etc.

· Eliassen Group will never ask you for personal information (home address, bank account, or check routing number) until you have worked with someone clearly associated with Eliassen Group.

If you have any indication of fraudulent activity, please contact.

About Eliassen Group:
Eliassen Group is a strategic consulting firm that helps organizations reach further and achieve more through our technology, business advisory, and life sciences solutions. For nearly 40 years, we have combined exceptional people, deep domain expertise, and intelligent capabilities to expand our clients’ capacity and accelerate meaningful outcomes. We are driven by a purpose to positively impact the lives of our employees, clients, consultants, and the communities we serve.
Eliassen is committed to building a diverse and inclusive team from a variety of backgrounds, perspectives, and skills. We are an Equal Opportunity and Affirmative Action Employer and all employment decisions are based on merit, performance, and business needs. Eliassen does not discriminate on the basis of race, color, gender identity or expression, sexual preference or orientation, sex (including pregnancy, childbirth, and related medical conditions), marital status, creed, religion, physical or mental disability, genetic information, military or veteran status, age, ancestry, national origin, citizenship status, prohibited criminal record inquiries of applicants and employees, or any other category protected by federal, state, or local laws.
Don’t miss out on our referral program! If we hire a candidate that you refer us to then you can be eligible for a $1,000 referral check!