Information Systems Security Engineer (MD) (Mid/Sr-TS/SCI FSP-Onsite)

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., * 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

• 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, * 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

OST has been supporting Government missions since 1996 and offers a comprehensive benefits package including:

• 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, 100 percent ONSITE. Must have Full Scope Poly from NSA. Prefer last poly within 7 years, but will consider others based on skill level and urgency of the program.