Information Systems Security Engineer (ISSE)

Tetrad Digital Integrity LLC; Fort Belvoir (VA); On-site; USD 120,000 - 160,000; Full time

Job summary

Tetrad Digital Integrity LLC (TDI) is seeking an ISSE with an active Secret Clearance to provide on-site information system security engineering support at Fort Belvoir. The position requires working five days a week on site with government and program management briefings.

You will apply RMF, manage ATO/POA&Ms, and maintain STIG compliance, patch management, and operate tools like eMASS, ACAS, ESS, SCAP, while coordinating with cyber teams to ensure audit readiness and secure configurations

Qualifications

• Bachelor of Science degree in a relatedarea.
• 10–15 years overall experience, with 5–10 years DoD/DoW in systems support and cybersecurity.
• DoD 8570 IAT Level II certification (Security+ CE, CYSA+, or CASP+ CE) required.

Responsibilities

• Brief Program Management and Government customers and cybersecurity personnel; briefings might be daily, weekly, monthly or ad-hoc; attention to detail.
• Create and manage eMASS authorization packages for two enclaves; support ATOs, POA&Ms and audit readiness.
• Document and manage vulnerabilities in POA&Ms; provide updates to Program Management and Government personnel.
• Implement and maintain security controls per DISA STIGs and DoD cybersecurity policies for secure configurations.
• Perform system hardening, patching, and vulnerability remediation using ACAS and ESS.
• Apply patches across Linux and Windows per DoD patch management policies; ensure timely remediation.
• Expertise in Windows Server and/or Linux (RHEL) administration, virtualization (VMware, Hyper-V, Nutanix), and networking basics.
• Hands-on experience with DoD tools such as ACAS, ESS, and SCAP.

Skills

Communication skills

Briefings

Detail oriented

RMF familiarity

Networking fundamentals

System hardening

Vulnerability remediation

Documentation

Education

Bachelor of Science degree in a relatedarea

Tools

ACAS

ESS/HBSS

SCAP

eMASS

STIG tools

Patch management tools

VMware

Hyper-V

Nutanix

Job description

Tetrad Digital Integrity (TDI) is a cybersecurity firm built for high-consequence environments where mission, complexity, and trust intersect. Our single focus has been delivering cyber solutions to effectively manage risk & the business of cyber for 25 years!

We are seeking an ISSE with an active Secret Clearance to provide onsite customer support at the Fort Belvoir customer site, 5 days a week.

RESPONSIBILITIES:

• Must possess excellent written and oral communication skills, with an ability to brief Program Management, Government customers (to include System Owner and/or COR) and Government Cybersecurity personnel. Briefings might be daily, weekly, monthly or on an ad-hoc basis. Must be detail oriented.

• Strong understanding of the DoD Risk Management Framework (RMF) and experience with tools such as Enterprise Mission Assurance Support Service (eMASS), ESS/HBSS, ACAS, patching solutions, etc.
• Create and manage authorization packages in eMASS for two enclaves. Collaborate with cybersecurity teams to support Authorization to Operate (ATO) packages, Plans of Action & Milestones (POA&Ms), and audit readiness, while maintaining detailed system documentation.
• Document and manage vulnerabilities in a Plan of Actions and Milestones (POA&M) and provide updates on open vulnerabilities to Program Management and Government personnel.
• Implement and maintain security controls in compliance with DISA Security Technical Implementation Guides (STIGs) and DoD cybersecurity policies to ensure the secure configuration of all systems.
• Perform system hardening, patching, and vulnerability remediation using tools such as the Assured Compliance Assessment Solution (ACAS) and Endpoint Security Solutions (ESS).
• Apply and manage patches and updates across all Linux and Windows systems in accordance with DoD patch management policies, ensuring timely remediation of vulnerabilities.
• Expertise in Windows Server and/or Linux (RHEL) administration, virtualization technologies (VMware, Hyper-V, Nutanix), and a comprehensive understanding of networking fundamentals, including routing, DNS, and firewalls.
• Hands-on experience with DoD-specific security tools such as ACAS, ESS (formerly HBSS), and Security Content Automation Protocol (SCAP) or other STIG tools.

QUALIFICATIONS:

• Bachelor of Science degree in a relatedarea
• 10-15 overall years of experience. Can have less overall YOE with a degree with 5 – 10 years of DoD/DoW experience in systems support and cybersecurity
• DoD 8570 IAT Level II certification (such as Security+ CE, CYSA+, or CASP+ CE) is required

TDI does business with the federal government, which restricts employment to individuals who are either US citizens or lawful permanent residents of the United States.

“TDI is an Equal Opportunity Employer. Employment decisions are made based on individual qualifications, merit, and business needs. We do not discriminate in employment opportunities or practices based on race, color, religion, sex, or national origin, in accordance with applicable federal laws.”