Principal Engineer/Microsoft Endpoint for Defender Enterprise

Fuse Eng; Fort Meade, Northern (MD, KY); On-site; USD 120,000 - 180,000; Full time

Job summary

Fuse Eng is seeking a Senior Systems Engineer (Level 3) to lead lifecycle engineering and scale-out architecture for Microsoft Defender for Endpoint and Trellix HX across hybrid environments.

You will translate threat intelligence into actionable IOCs, advise government stakeholders on system risks, and mentor junior engineers while ensuring secure, scalable endpoint protection for national security assets.

Qualifications

• Top Secret/SCI clearance required with Maryland polygraph.
• Experience deploying MDE across MECM/SCCM or Intune.
• Experience engineering and managing Trellix HX in restricted networks.
• Strong OS knowledge across Windows, Linux, and macOS; forensics basics.

Responsibilities

• Lead lifecycle engineering and scale-out architecture for MDE and Trellix HX across hybrid environments.
• Translate threat intel into custom IOCs using KQL and YARA.
• Advise government stakeholders on system risks and engineering considerations.
• Provide advanced forensic support to the SOC during high-priority incidents.
• Mentor junior/mid-level engineers within the program.

Skills

MDE architecture

Trellix HX

KQL

YARA rules

Threat hunting

OS internals

DoD IAM

Threat intel collaboration

Education

DoD 8570 IAM II/III

SC-200

AZ-500

Trellix engineering cert

Tools

MECM/SCCM

Intune

Cameo MBSE

Jira

Confluence

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.

Essential Duties and 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.

Requirements

• Top Secret SCI w/ Maryland Polygraph Security Clearance Required
• 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.
• Professional Standards: Compliance with DoD 8570/8140 IAM Level II or III baseline certifications.

Desired:

• Vendor Certifications: Microsoft Certified: Security Operations Analyst Associate (SC-200), Azure Security Engineer Associate (AZ-500), or Trellix Certified Engineering credentials.
• Methodologies & Toolsets: Experience with Model-Based Systems Engineering (MBSE), Cameo, and workflow management within the Atlassian Suite (Jira, Confluence).
• Technical Frameworks: Familiarity with NSA Technical Manual Standards (e.g., NSA DS-89) and defense-in-depth engineering principles.
• Core Competencies: Strong record of team collaboration, exceptional transparency in managing high-consequence infrastructure, and an aptitude for developing technical leadership pipelines