Information System Security Engineer

C5T Corporation; Illinois; On-site; USD 90,000 - 130,000; Full time

Benefits offered by this job

Competitive salary

Medical, dental, and vision insurance

401(k) with company match

Flexible Spending Account (FSA)

Life insurance

Employee Assistance Program

10 paid holidays

Paid time off aligned with mission

Job summary

C5T Corporation is seeking an Information System Security Engineer (ISSE) to support DoD information systems by implementing cybersecurity controls, hardening environments, and managing vulnerabilities. The role partners with cybersecurity engineers, admins, and program leadership to ensure compliant, secure solutions while enabling mission-focused modernization.

Location is on-site at Scott Air Force Base, Illinois, with limited telework based on mission requirements.

Qualifications

• Active Secret or Top Secret clearance.
• 3–5 years in security engineering, system hardening, or cybersecurity.
• Hands-on with STIG Viewer and SCAP Compliance Checker.
• Experience with Tenable Security Center or equivalent vuln mgmt.
• Knowledge of secure configuration management principles.
• Strong analytical, troubleshooting, and communication skills.
• Bachelor’s degree in CS/IT or equivalent.

Responsibilities

• Implement and document STIG configurations across systems and platforms.
• Conduct Security Impact Analyses for proposed changes.
• Run automated config validation with SCAP Compliance Checker.
• Manage vulnerabilities using Tenable Security Center.
• Assess cloud security posture with Tenable Cloud Security or equivalents.
• Support PAM implementation and administration (CyberArk).
• Develop and maintain secure baselines and guides.
• Support cybersecurity architect with engineering activities.
• Participate in security testing, audits, and monitoring.
• Produce documentation supporting cybersecurity compliance.
• Ensure systems comply with DoD policies and NIST 800-53 Rev 5.

Skills

Security engineering

System hardening

Analytical skills

Communication skills

Education

Bachelor's degree in CS/IT or related field

Tools

STIG Viewer

SCAP Compliance Checker

Tenable Security Center

CyberArk PAM

Job description

Information System Security Engineer (ISSE)

The Opportunity

This role works directly with Department of Defense stakeholders, cybersecurity engineers, system administrators, software developers, enterprise architects, and program leadership supporting mission-critical information systems. It is an opportunity to apply advanced cybersecurity engineering expertise to implement, assess, and maintain secure systems while supporting continuous modernization and compliance with Department of Defense cybersecurity requirements.

Work is primarily performed on-site at Scott Air Force Base, Illinois, supporting government and contractor teams in mission-focused environments.

Company Overview

C5T Corporation is a Service-Disabled Veteran-Owned Small Business headquartered at Scott Air Force Base, Illinois. Founded in 2005 by three veterans, C5T values practical, innovative-minded professionals with a passion for mission success. We specialize in bridging the gap between operational and technical domains to support critical Department of Defense missions.

Core Values: Integrity, Excellence, Patriotism

Position Summary

C5T is seeking an Information System Security Engineer (ISSE) to support Department of Defense information systems by implementing cybersecurity controls, hardening operating environments, managing vulnerabilities, and engineering secure technical solutions. This position serves as a key member of the cybersecurity engineering team responsible for implementing security controls, supporting Risk Management Framework activities, and ensuring compliance with Department of Defense and National Institute of Standards and Technology cybersecurity standards.

Location: Scott Air Force Base, Illinois. Work will primarily take place in government workspaces with limited telework based on mission requirements.

Key Responsibilities

• Implement and document Security Technical Implementation Guide (STIG) configurations across assigned systems and platforms.
• Conduct Security Impact Analyses (SIAs) for proposed system changes.
• Execute automated configuration validation using the Security Content Automation Protocol (SCAP) Compliance Checker.
• Manage vulnerability identification, tracking, and remediation using Tenable Security Center or equivalent tools.
• Assess cloud infrastructure security posture using Tenable Cloud Security or comparable solutions.
• Support CyberArk Privileged Access Management (PAM) implementation and administration.
• Develop and maintain secure configuration baselines and technical implementation guides.
• Support the Cybersecurity Architect with technical security implementations and engineering activities.
• Participate in security testing, audits, and continuous monitoring activities.
• Develop technical documentation supporting cybersecurity compliance.
• Ensure assigned systems comply with Department of Defense cybersecurity policies and National Institute of Standards and Technology Special Publication 800-53 Revision 5.

Required Qualifications

• Active Secret or Top Secret security clearance.
• Three to five years of experience in security engineering, system hardening, or cybersecurity engineering.
• Hands‑on experience with Security Technical Implementation Guide Viewer and the Security Content Automation Protocol Compliance Checker.
• Experience with Tenable Security Center or equivalent vulnerability management solutions.
• Knowledge of secure configuration management principles.
• Strong analytical, troubleshooting, and communication skills.
• Bachelor’s degree in Computer Science, Cybersecurity, Information Technology, Information Systems, Software Engineering, Data Science, or equivalent experience.

Desired Qualifications

• Experience administering CyberArk Privileged Access Management solutions.
• Familiarity with Tenable Cloud Security or equivalent cloud assessment tools.
• Experience supporting Department of Defense cloud environments at Impact Levels 2 through 6.
• Certified Ethical Hacker (CEH) or other Department of Defense 8140‑approved cybersecurity certification.
• Experience supporting mission‑critical Department of Defense information systems.

Benefits

• Competitive salary
• Medical, dental, and vision insurance options
• 401(k) with company match
• Flexible Spending Account (FSA)
• Supplemental benefits including accident, critical illness, and hospital indemnity coverage
• Company‑paid life insurance
• Employee Assistance Program
• 10 paid holidays annually
• Responsible Paid Time Off aligned with mission needs

Equal Opportunity Statement

C5T is a merit‑based employer committed to affirmative action and nondiscrimination for all qualified applicants, including individuals with disabilities and protected veterans, in accordance with Section 503 and the Vietnam Era Veterans' Readjustment Assistance Act (VEVRAA).