Senior ISSE – Security Systems Architect

L3Harris Technologies; Greenville (TX); On-site; USD 120,000 - 160,000; Full time

Job summary

L3Harris Technologies in Greenville, TX is seeking an experienced Information Systems Security Engineer (ISSE) to join the Sensor Infrastructure team. You will lead security requirements, perform risk-based assessments, and drive secure system design across hardware, software, and networks.

The ideal candidate brings deep expertise in vulnerability scanning, compliance, and Authorization to Operate (ATO) documentation, with strong communication for leadership and cross-functional teams.

Qualifications

• Active US TS/SCI security clearance.
• DoD 8140.03 IASAE Level 2 certification.
• Bachelor’s Degree with 9+ years of relevant experience or equivalent.

Responsibilities

• Author and review security requirements aligned with frameworks and policies.
• Identify and implement improvements to security processes, systems, and controls.
• Prepare and deliver technical briefing materials for leadership and stakeholders.
• Lead system requirements management, decomposition, traceability, verification, and validation.
• Support hardware selection for mission systems and infrastructure.
• Develop and review verification plans, test procedures, and test reports.
• Translate complex technical issues into actionable insights for stakeholders.

Skills

Security mindset

Communication

Leadership

Education

Bachelor’s Degree + 9 years

Graduate Degree + 7 years

13 years experience in lieu of degree

Tools

Nessus

Tenable

ACAS

MBSE tools

DOORS

Cameo

JIRA

Job description

L3Harris Technologies in Greenville, TX is seeking an experienced Information Systems Security Engineer (ISSE) to join the Sensor Infrastructure team. You will lead security requirements, perform risk-based assessments, and drive secure system design across hardware, software, and networks.

The ideal candidate brings deep expertise in vulnerability scanning, compliance, and Authorization to Operate (ATO) documentation, with strong communication for leadership and cross-functional teams.