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# Information System Security Engineer (ISSE)

- **Company:** DEMASE TECHNICAL SERVICES, LLC
- **Location:** Oak Ridge, TN, United States
- **Salary:** $105,000.0 - $165,000.0
- **Contract:** Permanent contract
- **Skills:** Computing Platforms, Configuration Management, Information Systems, System Configuration, Information Security Management, Network Security, SAP (Applications), Security Information and Event Management, Software Engineering, Information Technology, Plan of Action and Milestones, Vulnerability Analysis
- **Published:** July 4, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=36bd711ccec89c75

## About the Role

* Active DOE Q security clearance (or equivalent DoD TS)
 * Bachelor's degree in cybersecurity, computer science, engineering, or a related field (or equivalent experience)
 * Strong understanding of NIST RMF, NIST SP 800-53, and NIST SP 800-171 security control families
 * Experience developing security authorization documentation
 * Proficiency in vulnerability assessment, risk analysis, and secure system configuration
 * Familiarity with classified computing environments, network security, and enclave architectures
 * Strong written and verbal communication skills with the ability to work both independently and within interdisciplinary teams

Preferred skills/qualifications

 * CISSP, CAP, Security+, CASP+, or other relevant certifications
 * Experience with DOE assessment and authorization tools or workflows
 * Background in system administration, network engineering, or software development
 * Experience implementing secure enclave designs, virtualization hardening, or cross-domain solutions

## Description

The Information System Security Engineer (ISSE) will support cybersecurity engineering, design, assessment, and compliance efforts for both DOE classified systems and Controlled Unclassified Information (CUI) environments. The ISSE ensures information systems are architected, implemented, and maintained in alignment with DOE directives, NIST frameworks, and organizational cybersecurity requirements. This role collaborates with engineering, cybersecurity, operations, and program leadership to maintain secure, compliant, and resilient information systems.

This role requires the ability to obtain an active DOE Q security clearance (or equivalent DoD TS).

 * Develops and maintains system security architectures for DOE classified and CUI systems;
 * Integrates security controls into system design, development, and implementation activities across the system lifecycle;
 * Produces and maintains RMF authorization documentation, including SSPs, SPPs, RARs, SAP/SAR inputs, and associated artifacts;
 * Performs risk assessments, vulnerability analysis, and technical security evaluations;
 * Ensures system compliance with DOE O 205.1C, DOE O 471.6, DOE cybersecurity program guidance, NIST SP 800-53, and NIST SP 800-171;
 * Works closely with ISSMs, ISSOs, system administrators, and network engineers to validate, implement, and assess security controls;
 * Supports continuous monitoring activities, configuration management, change control, and POA&M lifecycle management;
 * Assists with internal and external cybersecurity audits, inspections, and DOE assessments;
 * Leads or supports technical troubleshooting of security-related issues affecting classified or CUI systems;
 * Installs, configures, and maintains security-related tools such as SIEM platforms, vulnerability scanners, and monitoring solutions;
 * Contributes to incident response activities in accordance with DOE reporting requirements; and
 * Maintains awareness of evolving threats, security technologies, and updates to DOE and NIST requirements., DeMase Technical Services, LLC is committed to providing reasonable accommodation to applicants with disabilities where appropriate. Determinations on requests for reasonable accommodation will be made on a case-by-case basis.


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