Senior Systems Engineer – Endpoint Security

Job Title:

Senior Systems Engineer – Endpoint Security Job Category:
Information Technology Time Type:
Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type:
Regular Percentage of

Travel Required:

None Type of Travel:
None* * *

The Opportunity
CACI is seeking a Senior Systems Engineer that will serve as a principal technical leader and subject matter expert for the National Security Agency’s Enterprise Endpoint Detection and Response (EDR) Program. Working within a highly classified, multi-domain environment, you will shape the strategic architecture, integration, deployment, and optimization of world‑class endpoint security platforms including Microsoft Defender for Endpoint (MDE) and Trellix HX.

This is a chance to directly strengthen national security by engineering resilient endpoint defense capabilities that provide full enterprise visibility, rapid threat containment, and robust configuration management.

Responsibilities

• Lead the full lifecycle engineering and scale-out architecture of MDE and Trellix HX across hybrid environments, including on‑premises, cloud, and virtual desktop infrastructures (VDI).

• Develop advanced system engineering documentation, deployment strategies, and implementation plans.

• Optimize agent configurations, exclusion policies, and system performance to ensure mission success and minimize friction across high‑demand environments.

• Monitor and maintain enterprise endpoint health at scale.

• Work directly with threat hunters and intelligence analysts to convert actionable intelligence into custom technical indicators of compromise (IOCs) using KQL and YARA.

• Serve as a primary technical advisor to Government stakeholders regarding system risks, design decisions, and engineering recommendations.

• Provide advanced forensic and technical support to the SOC during high‑priority incidents.

• Mentor junior and mid‑level engineers, fostering growth, collaboration, and technical excellence.

Qualifications:

Required:

• 20+ years of experience as a Systems Engineer on programs of similar scope, type, and complexity.

• Proven experience planning and leading Systems Engineering efforts.

• Bachelor’s degree in Systems Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or a related field from an accredited institution.

  • Five (5) additional years of Systems Engineering experience may be substituted for a bachelor’s degree.

• Microsoft Defender for Endpoint Expertise: Hands‑on engineering experience with MDE architecture, deployment via MECM/SCCM or Intune, policy ring management, and advanced hunting using Kusto Query Language (KQL).

• Trellix HX Expertise: Proven ability to engineer, deploy, and manage Trellix HX controllers and agents within air‑gapped or highly restricted networks, including creating OpenIOC and YARA rules.

• Operating System & Forensic Knowledge: Deep understanding of Windows, Linux, and macOS internals, including file systems, registries, and process execution behavior.

• Professional
  
  Certifications:
  
  Compliance with DoD 8570/8140 IAM Level II or III baseline requirements.

Desired:

• Vendor
  
  Certifications:
  
  Microsoft Security Operations Analyst (SC‑200), Azure Security Engineer (AZ‑500), and/or Trellix engineering certifications.

• Methodologies & Tools: Experience with Model‑Based Systems Engineering (MBSE), Cameo, and Atlassian suite tools such as Jira and Confluence.

• Technical Frameworks: Familiarity with NSA Technical Manual standards (e.g., NSA DS‑89) and defense‑in‑depth engineering principles.

• Core Competencies: Demonstrated collaboration skills, transparency in managing high‑consequence systems, and a passion for developing and mentoring technical talent.

What You Can Expect:

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through…