Information Systems Security Engineer (ISSE)

At Two Six Technologies, we build, deploy, and implement innovative products that solve the world’s most complex challenges today. Through unrivaled collaboration and unwavering trust, we push the boundaries of what’s possible to empower our team and support our customers in building a safer global future.

Information Systems Security Engineer (ISSE)

Two Six Technologies is currently seeking an Information Systems Security Engineer (ISSE)

The ISSE will lead and execute security engineering activities across complex, enterprise-scale environments. This role requires deep technical expertise across infrastructure, platforms, and applications, combined with expert-level, hands-on experience implementing the NIST Risk Management Framework (RMF) within federal government environments. The ideal candidate is a technical practitioner, not just an advisor – someone who can design, implement, assess, and secure systems end-to-end while directly supporting system authorization, continuous monitoring, and risk-based decision-making. This role also serves as the technical focal point for all security incidents, leading triage, investigation, and resolution efforts in coordination with program and enterprise security teams.

Location: Chantilly, VA

What you will do:

• Serve as the Cyber Security Engineer SME, providing hands-on security engineering across all system layers (infrastructure, platform, and application)
• Engineer, implement, and validate security controls in accordance with NIST SP 800-53 and RMF requirements
• Lead and support RMF lifecycle activities (Categorize, Select, Implement, Assess, Authorize, Monitor)
• Perform security engineering for:
  • Network architectures and boundary protections
  • Windows and Linux operating systems
  • Storage and virtualization platforms
  • Databases and data platforms
  • Web services, APIs, and application stacks
  • Custom and COTS/GOTS software solutions
• Provide technical input to RMF artifacts, including:
  • System Security Plans (SSP)
  • Security Control Assessments (SCA) support
  • POA&Ms
  • Risk assessments and security impact analyses
• Collaborate with system owners, architects, developers, ad operations teams to embed security into system design and implementation
• Support ATO, re-authorization, and continuous monitoring activities
• Identify security risks and provide practical, technically sound mitigation strategies
• Participate in security reviews, technical design reviews, and vulnerability remediation efforts
• Serve as technical l point of contact for all security incidents affecting the program
• Lead triage and analysis of new security alerts from SIEM, IDS/IPS, and other security monitoring tools
• Drive remediation efforts for recurring security alerts, identifying root causes and implementing systemic fixes
• Coordinate incident response activities between program stakeholders and enterprise security operations
• Act as primary liaison between program teams and enterprise security for incident escalation, resolution, and reporting
• Perform forensic analysis and technical investigations of security events
• Document security incidents, response actions, and lessons learned
• Develop and maintain runbooks and playbooks for common security incident types

What you will need (basic qualifications):

• Minimum ten (10) years of related cyber security engineering experience
• Proven hands-on Cyber Security Engineer SME, not policy-only or audit-only
• Comfortable working across network, system, platform, and application layers
• Deep understanding of how security controls are actually implemented and validated
• Experience in federal RMF-driven environments
• Able to bridge security, engineering, and compliance effectively
• Experienced in managing security incidents from detection through resolution
• Skilled at balancing immediate incident response needs with long-term security improvements
• Effective collaborator across organizational boundaries during high-pressure security events
• Operate independently as the technical authority for system security engineering
• Demonstrate the ability to provide technical hands-on configuration, validation, and assessment of security controls
• Translate RMF and NIST requirements into real-world technical implementations
• Communicate complex technical security issues clearly to both technical and non-technical stakeholders
• Maintain a strong balance between security compliance and operational practicality
• Lead rapid response to security incidents with minimal guidance
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