Trellix/MDE Systems Engineer 3

Lentech Inc.; Fort Meade (MD); On-site; USD 203,305 - 217,122; Full time

Job summary

Lentech Inc. in Fort Meade, MD seeks a Senior Systems Engineer (Level 3) to lead the EDR program, architect, deploy, and optimize Microsoft Defender for Endpoint and Trellix HX across hybrid environments, ensuring endpoint visibility and threat containment for national security assets.

You will mentor junior engineers, translate threat intel into actionable IOCs with KQL and YARA, and serve as a technical advisor to Government stakeholders on system risks and engineering considerations.

Qualifications

• Twenty years of SE experience in programs of similar scope and complexity.
• Active TS/SCI w/ FSP through MD required.
• DoD 8570/8140 IAM Level II or III baseline certifications required.
• MDE architecture, deployment via MECM/SCCM or Intune, and advanced hunting with KQL.
• Treliix HX controllers and agents in restricted networks; OpenIOC and YARA rule creation.
• Windows, Linux, and macOS internals knowledge; registry and file system expertise.

Responsibilities

• Lead lifecycle engineering and scale-out architecture of MDE and Trellix HX across hybrid environments.
• Author complex system engineering and implementation plans; tune agent configurations and exclusions.
• Monitor endpoint health at scale and collaborate with threat hunters to translate intel into IOCs.
• Provide advanced forensic support during critical incidents; mentor junior engineers; advise government stakeholders.

Skills

Systems Engineering

MDE Expertise

Trellix HX

KQL

YARA Rules

Threat Intelligence

Incident Response

Mentoring

Education

Bachelor’s degree in System Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or related discipline

Five years of additional SE experience substituted for a bachelor’s

Tools

MECM/SCCM

Intune

Job description

Description

• The Senior Systems Engineer (Level 3) serves as a principal technical leader and subject matter expert within the National Security Agency’s Enterprise Endpoint Detection and Response (EDR) Program.
• Operating in a highly classified, multi-domain infrastructure, the successful candidate will drive the strategic architectural design, end-to-end integration, deployment, and optimization of premier endpoint security platforms, specifically Microsoft Defender for Endpoint (MDE) and Trellix HX.
• This critical role bridges high-level systems architecture with operational defense capabilities, ensuring total endpoint visibility, robust threat containment, and resilient configuration management across all enterprise and mission-critical assets to defend national security infrastructure against sophisticated cyber threats.

Responsibilities

• The Systems Engineer 3 is responsible for leading the lifecycle engineering and scale-out architecture of MDE and Trellix HX across hybrid environments, including on-premises, cloud, and virtual desktop infrastructures (VDI).
• This includes authoring complex system engineering and implementation plans, tuning agent configurations and exclusion policies to eliminate mission friction, and monitoring overall endpoint health at scale.
• The engineer will collaborate closely with threat hunting and intelligence analysts to translate actionable threat intelligence into custom technical indicators of compromise (IOCs), utilizing Kusto Query Language (KQL) and YARA rules.
• Additionally, the individual will act as a primary technical advisor to Government stakeholders on system risks and engineering considerations, provide advanced forensic support to the SOC during critical high-priority incidents, and actively mentor junior and mid-level engineering personnel within the program.

Qualifications

• Twenty (20) years experience as a SE in programs and contracts of similar scope, type and complexity is required. Demonstrated experience in planning and leading Systems Engineering efforts is required.
• Active and current TS.SCI w FSP through MD
• Professional Standards: Compliance with DoD 8570/8140 IAM Level II or III baseline certifications
• Microsoft Defender for Endpoint (MDE) Expertise: Proven engineering experience with MDE architecture, deployment strategies via MECM/SCCM or Intune, policy ring management, and advanced hunting using Kusto Query Language (KQL).
• Trellix HX Expertise: Demonstrated experience engineering, deploying, and managing Trellix HX (formerly FireEye) controllers and agents within air-gapped or highly restricted networks, including the creation of OpenIOC and YARA rules.
• Operating System & Forensic Knowledge: In-depth technical understanding of Windows, Linux, and macOS internals, including file systems, registry structures, and process execution mechanics.

Education

• Bachelor’s degree in System Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or related discipline from an accredited college or university is required.
• Five (5) years of additional SE experience may be substituted for a bachelor’s.

Salary

The proposed salary range for this position is: $$203,305.00 $217,122.00

Equal Employment Opportunity

Lentech, Inc. is an Equal Employment Opportunity (EEO) employer and considers all qualified applicants for employment without regard to race, color, religion, gender identification, national origin, sexual orientation, age, marital status, disability, protected veteran status, or any other factor prohibited by applicable law. We are proud of the diversity of our staff and seek diversity in our applicants.