Industry: Information Technology - Other
Job Category: Information Technology - Other IT
Information System Security Engineer (ISSE)
Locations: Maryland
Clearance Required: Active TS/SCI with Full Scope Polygraph
Must have Full Scope Poly from NSA
Citizenship: U.S. Citizenship Required
Certification Requirement: DoD 8570/8140 IASAE Level II Compliant Certification Required
Job Description
Open Systems Technologies Corporation (OST) is seeking Information System Security Engineers (ISSEs) to support mission-critical Government programs. This role focuses on integrating cybersecurity engineering principles across system design, implementation, accreditation, and sustainment activities within complex classified environments.
The ISSE will support full Risk Management Framework (RMF) execution, Assessment & Authorization (A&A) activities, and continuous cybersecurity compliance efforts while working closely with system administrators, ISSOs, ISSMs, and system owners.
Required Qualifications
Active TS/SCI with Full Scope Polygraph security clearance
U.S. Citizenship
DoD 8570/8140 IASAE Level II compliant certification required
Strong understanding of the Risk Management Framework (RMF)
Experience supporting Assessment & Authorization (A&A) and Authority to Operate (ATO) processes
Experience with security control implementation, validation, and continuous monitoring
Familiarity with NIST SP 800-37 and NIST SP 800-53 (Rev. 3 and/or Rev. 5)
Experience with RMF and cybersecurity tools such as:
LATTEART
XACTA
BISCOTTI
WATCHCAT
STE
Experience with compliance and configuration scanning tools
Strong analytical, troubleshooting, and documentation skills.
Technical Responsibilities
Support the full RMF lifecycle for classified systems
Assist with A&A package development and Authority to Operate (ATO) maintenance
Implement, assess, and validate security controls
Perform Security Control Traceability and technical validation
Support system boundary definition and security architecture documentation
Develop and maintain RMF artifacts and body of evidence packages
Conduct compliance and vulnerability scanning analysis
Validate findings including false positive identification and remediation verification
Support STIG implementation and configuration hardening
Manage patch validation and security compliance efforts
Participate in Continuous Monitoring (ConMon) activities
Core ISSE Skill Areas
Assessment & Authorization (A&A) execution and support
Security Control implementation and validation
RMF documentation and artifact development
System boundary definition and architecture support
Vulnerability management and remediation tracking
STIG implementation and compliance validation
Technical security assessment and risk analysis
Continuous Monitoring (ConMon) support
Preferred Qualifications
Experience in classified Government cybersecurity environments
Familiarity with enterprise Linux, network, or cloud systems
Experience working with ISSOs, ISSMs, SCAs, and System Owners
Understanding of vulnerability management and cybersecurity automation tools
Experience supporting large-scale enterprise or mission systems
IASAE Level II Certification Examples
Acceptable certifications include
CISSP
CASP+
CCSP
CSSLP
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