Information Systems Security Engineer (ISSE)

Position Overview

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.

Required Qualifications

• Active TS/SCI with 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: LATTE, ART, 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
• Develop and maintain RMF artifacts and body of evidence packages
• Support system boundary definition and security architecture documentation
• 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

• 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
• Understanding of vulnerability management and cybersecurity automation tools
• Experience supporting large-scale enterprise or mission systems
• IASAE Level II Certification Examples: CISSP, CASP+, CCSP, CSSLP

Benefits

• 3 Weeks Paid Time Off
• 11 Federal Holidays
• Medical and Dental Coverage
• Short-Term Disability (STD)
• Long-Term Disability (LTD)
• Life Insurance
• AD&D Coverage
• 401(k) with up to 4% Company Match

About OST

Open Systems Technologies Corporation (OST) has been supporting Government missions since 1996 and offers a comprehensive benefits package including:

• Medical and Dental Coverage
• Short-Term Disability (STD)
• Long-Term Disability (LTD)
• Life Insurance
• AD&D Coverage
• 401(k) with up to 4% Company Match

OST is an Equal Opportunity Employer providing innovative cybersecurity and engineering solutions to support critical Government missions. We value technical excellence, collaboration, and continuous professional growth.