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…