Information Systems Security Engineer (ISSE)

VTG Defense; Chantilly (VA); On-site; USD 100,000 - 130,000; Full time

Job summary

A defense contractor based in Chantilly, Virginia is seeking an experienced Information Systems Security Engineer (ISSE) to design, implement, and maintain security controls across enterprise systems. The ideal candidate has at least 5 years of experience in information security and a bachelor's degree in a related field. Responsibilities include supporting the Risk Management Framework, conducting security assessments, and collaborating with various teams to ensure compliance with NIST policies.

Qualifications

• Active TS/SCI with Polygraph required.
• 5+ years of experience in information security.
• Hands-on experience with RMF and NIST 800-53 controls.
• Knowledge of operating systems (Windows, Linux) and network security principles.

Responsibilities

• Design, implement, and maintain security controls for information systems.
• Support the RMF lifecycle including control selection and authorization.
• Conduct security assessments and vulnerability scans.
• Collaborate with teams to remediate vulnerabilities.

Skills

Information security

System security engineering

Risk Management Framework (RMF)

NIST 800-53 controls

Vulnerability scanning

Windows and Linux operating systems

Security tools (SIEM, IDS/IPS)

Incident response

Education

Bachelor's degree in Cybersecurity, Information Technology, Computer Science, or related field

Tools

ACAS

Nessus

Job description

Overview

We are seeking a highly skilled Information Systems Security Engineer (ISSE) to design, implement, and maintain security controls across enterprise systems and networks. This role ensures systems are compliant with security requirements while supporting mission-critical operations. The ISSE will work closely with system owners, engineers, and cybersecurity teams to integrate security throughout the system lifecycle.

What will you do?

• Design, implement, and maintain security controls for information systems and networks
• Support the Risk Management Framework (RMF) lifecycle, including system categorization, control selection, implementation, assessment, and authorization
• Conduct security assessments, vulnerability scans, and risk analysis
• Develop and maintain system security documentation (SSP, POA&M, SAR, etc.)
• Ensure systems comply with NIST, RMF, and organizational security policies
• Collaborate with ISSOs, system administrators, and developers to remediate vulnerabilities
• Support continuous monitoring and incident response activities
• Implement and manage security tools (SIEM, IDS/IPS, endpoint protection, etc.)
• Provide technical guidance on secure system architecture and design
• Stay current on emerging threats, vulnerabilities, and security technologies

Do you have what it takes?

• Active TS/SCI with Polygraph required.
• Bachelor's degree in Cybersecurity, Information Technology, Computer Science, or related field (or equivalent experience)
• 5+ years of experience in information security, with focus on system security engineering
• Hands‑on experience with RMF and NIST 800‑53 controls
• Experience developing and maintaining A&A documentation (SSP, POA&M, ATO packages)
• Knowledge of operating systems (Windows, Linux) and network security principles
• Experience with vulnerability scanning tools (ACAS, Nessus, or similar)
• Familiarity with security tools such as SIEM, firewalls, and endpoint protection
• Understanding of encryption, identity management, and access control mechanisms