Reflexive Concepts

Systems Engineer III

Reflexive Concepts • $100K — $140K *
Fort George G Meade, MD 20755In-Person
Information Technology
15+ years of experience
Today
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Job Overview by Ladders

Qualifications

  • 20 years of experience in similar projects and programs
  • Bachelor's Degree in Computer Science or related field
  • Expertise in Microsoft Defender for Endpoint (MDE) architecture and deployment
  • Experience with Trellix HX in air-gapped networks
  • In-depth knowledge of Windows, Linux, and macOS internals

Responsibilities

  • Serve as principal technical leader within the EDR Program
  • Lead lifecycle engineering and scale-out architecture for MDE and Trellix HX
  • Collaborate with analysts to translate threat intelligence into IOCs
  • Act as primary technical advisor to Government stakeholders
  • Provide advanced forensic support to SOC during critical incidents
  • Mentor junior and mid-level engineering personnel

Benefits

  • Opportunities for advanced training and professional development
  • Access to cutting-edge security technologies
  • Collaborative work environment with a national security focus
  • Potential for career growth into leadership roles
Full Job Description
Qualifications:
  • Twenty (20) years of experience supporting projects and programs similar in scope and complexity
  • Bachelors Degree in Computer Science or a related field
Duties and Responsibilities:
  • 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.
  • Lead the lifecycle engineering and scale-out architecture of MDE and Trellix HX across hybrid environments, including on-premises, cloud, and virtual desktop infrastructures (VDI), to include authoring complex system engineering and implementation plans, tuning agent configurations and exclusion policies to eliminate mission friction, and monitoring overall endpoint health at scale
  • 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
  • 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
  • Actively mentor junior and mid-level engineering personnel within the program
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

About Reflexive Concepts

Reflexive Concepts Careers

Joining Reflexive Concepts presents an unparalleled opportunity to become part of a leading team of professionals dedicated to innovation and technology. This is a pivotal time to engage with a company that values growth, leadership, and diversity in its workforce.

Explore Job Opportunities

Reflexive Concepts is actively seeking talented individuals for various positions across the company. With a commitment to professional excellence, Reflexive Concepts offers a dynamic environment where skills are honed, and careers flourish. Explore the multitude of job opportunities that range from internships to full-time positions, each offering a unique chance to contribute to groundbreaking projects.

Experience the Culture and Benefits

At Reflexive Concepts, the culture thrives on diversity, innovation, and leadership. Employees enjoy a range of benefits designed to support their professional and personal growth. The company is dedicated to fostering an inclusive environment where every team member’s contribution is valued. Benefits include comprehensive health care, flexible working conditions, and continuous professional development through diversity training and leadership workshops.

Engage in Professional Growth

Career advancement is a cornerstone of employment at Reflexive Concepts. The company supports a trajectory of professional growth through robust training programs, access to global resources, and opportunities to lead. Networking within the industry and participating in global teams allow employees to gain valuable insights and experiences that propel their careers forward.

Innovative Work Environment

Reflexive Concepts is at the forefront of technological advancement and industry innovation. Employees are encouraged to push the boundaries of what is possible, bringing fresh ideas and perspectives to their work. The collaborative atmosphere fosters a sense of community and drives collective success.

Join the Team

Reflexive Concepts is hiring! Search open positions that align with your skills and interests. The company looks for passionate, curious, and solution-driven team players. Prepare your resume, sharpen your interview skills, and get ready to embark on a rewarding career path with Reflexive Concepts.

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Learn more about Reflexive Concepts
Size
11 employees
Industry
Business Services
* Ladders Estimates

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