Information System Security Engineer (ISSE) - Top Secret Clearance (SCI Eligible)

JFL Consulting LLC • Washington, DC

133d

About The Position

With more than twenty years of securing some of the U.S. Department of Defense and the Intelligence Community’s most critical networks, JFL Consulting, LLC provides advanced network security solutions to a range of US Government and US commercial clients. Our cybersecurity operators are experts at assessing and defending mission-critical data and the networks that facilitate their operation. We are focused on delivering advanced products and industry best practices that meet each customer’s unique requirements. Visit www.jflconsulting.com

JFL Consulting, LLC is seeking a highly skilled Information System Security Engineer (ISSE) to support the design, development, and accreditation of a DoD network environment. This is a critical role in shaping a secure architecture from the ground up, ensuring that all systems, applications, and connections meet stringent DoD cybersecurity requirements.

Requirements

• U.S. Citizenship and TS/SCI Clearance
• 8+ years of professional experience in cybersecurity, with direct involvement in RMF processes and system accreditation
• Expert knowledge of the full DoD RMF process, with proven experience taking new systems through ATO
• Hands-on experience with XACTA and eMASS for accreditation
• Strong technical background in both Windows and Linux platforms
• Proficiency in DoD STIGs, IA tools (SCCVI, SCRI, HBSS), and vulnerability scanning solutions
• Ability to design security into network architectures and ensure compliance across system builds
• Skilled in risk assessment, problem-solving, and troubleshooting within complex environments
• Proficiency in system hardening and compliance across Windows and Linux platforms
• Experience integrating IA and vulnerability management tools into enterprise environments
• Knowledge of secure network architecture design and implementation
• Strong working knowledge of DoD STIGs, RMF, and accreditation requirements
• Familiarity with IA tools and compliance processes across DoD systems
• Ability to apply emerging networking technologies and cybersecurity trends to system builds
• Strong written and verbal communication skills to brief both technical and non-technical stakeholders
• Ability to collaborate across cross-functional teams and government stakeholders
• High attention to detail and organizational skills, especially in compliance documentation
• Minimum Required Certification: DoD 8140 / 8570 IAT Level II-compliant certification (e.g., Security+ CE, CySA+, GCIH, CISSP)

Nice To Haves

• Bachelor’s degree in Cybersecurity, Information Systems, or a related technical field is preferred
• Equivalent military or professional experience may be considered in lieu of a degree

Responsibilities

• Lead security engineering efforts for a new DoD network, ensuring end-to-end security integration across design, build, and deployment phases
• Establish repeatable processes and procedures to track and mitigate risks throughout the project lifecycle
• Provide technical risk assessments and present findings to senior leadership in both written reports and oral briefings
• Perform additional duties as required in support of program mission
• Conduct security architecture reviews for new hardware, software, baselines, and applications introduced into the environment
• Collaborate with engineers to design and implement remediation and mitigation strategies
• Ensure all network security measures, configurations, and controls are implemented according to DoD STIGs and best practices
• Develop and update System Security Plans (SSPs), security controls, and supporting documentation aligned with NIST SP 800-53 and DoD policies
• Guide RMF and A&A activities for new systems, including preparation and maintenance of full ATO packages
• Document and maintain security infrastructure standards, policies, and procedures for the environment
• Manage Plan of Action & Milestones (POA&M) items, ensuring vulnerabilities are tracked, documented, and resolved
• Conduct ongoing risk assessments and ensure vulnerabilities are addressed in a timely manner

Benefits

• 100% employer-paid medical, dental, and vision for employees and dependents
• 401(k) with 3% company contribution and immediate vesting
• Generous PTO policy (15 vacation, 5 sick, 2 personal days)
• Reimbursement for job-related certifications, generous training budget and company provided access to training platforms.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level