Information Systems Security Engineer

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Information Systems Security Engineer
Company Overview: Founded over 20 years ago and headquartered in Arlington, Virginia, The Intelligence & Security Associates, LLC (ISA) provides consulting services to federal clients in Intelligence and National Security matters and specializes in delivering strategic consulting and innovative solutions. ISA also provides education & training to federal government agencies as well as private sector companies and academic institutions in the areas of intelligence analysis, budget formulation policy development, and more. Our company also delivers systems engineering and engineering management services to federal clients that focus on the design, development, integration, and management of complex systems.
Job Description: The Information Systems Security Engineer (ISSE) is responsible for the implementation, configuration, and sustainment of secure classified IT systems across multiple operational environments. This role requires extensive knowledge of the Risk Management Framework (RMF), ICD 705, and DoD Security Technical Implementation Guides (STIGs). The ISSE works closely with the Security Department, IT teams, and program stakeholders to ensure classified systems remain compliant with DoD and Intelligence Community cybersecurity requirements. This is a hands-on technical role supporting accreditation efforts, system hardening, and ongoing security compliance across multiple classified spaces. This is a full-time position located on-site in Arlington, Virginia.
Work Model: Our people-first culture prioritizes the benefits of flexibility and collaboration. Consistent with government and industry standards that support a more fulsome return to in-office culture, ISA supports our clients and provides a working environment that promotes professional development opportunities through peer engagement and face-to-face mentoring. The ability to meet across teams at the office and cross-pollinate information is critical to our success.
Responsibilities: Implements and maintains secure classified IT systems in compliance with RMF, ICD 705, and DoD STIGs. Supports assessment and authorization activities, applies hardening baselines, and works with security and IT teams to ensure systems remain accredited and compliant across multiple environments.
Duties:
Maintain security compliance of classified systems in accordance with RMF, JSIG, NIST SP 800-53, and DoD policies.
Apply and manage DoD STIGs to harden systems and mitigate vulnerabilities.
Support Assessment & Authorization (A&A) efforts, including documentation, control validation, and continuous monitoring activities.
Develop and maintain security documentation such as System Security Plans (SSPs), POA&Ms, SCTMs, and security test results.
Collaborate with the Security Department, system administrators, and facility staff to support secure operations across multiple classified spaces.
Implement security controls and monitor system compliance for multiple classified environments.
Assist in audit readiness and respond to internal and external cybersecurity assessments.
Monitor and report system vulnerabilities using scanning tools and coordinating remediation efforts.
Enforce security policies for system use, data handling, media control, and secure configurations.
Ensure compliance with ICD 705 for classified space operations, including coordination on TEMPEST and physical security requirements.
Support incident response activities and ensure timely reporting of cybersecurity events in classified environments.
Maintain awareness of changes to DoD and IC cybersecurity requirements and adjust practices accordingly.
Coordinate with program stakeholders to align technical and security efforts with mission and contract objectives.
Provide technical support for system administrators and users regarding compliance-related configurations and procedures.
Assist in the secure configuration and management of boundary protection devices, encryption tools, and classified infrastructure.
Other Duties:
Duties, responsibilities, and activities can change at any time based on position requirements. These changes will be communicated by your supervisor.
Supervisor Responsibilities: None
Clearance Required: Applicants must have at least an active Secret clearance and be able to obtain a clearance at the TS/SCI level. Preference will be given to those who have an active TS/SCI clearance. Applicants must be able to submit documentation establishing U.S. Person status upon hiring. All ISA employees are required to uphold and maintain trustworthiness and suitability requirements of the U.S. federal government.
Experience Required: Experience should include but is not limited to working knowledge of:
Experience supporting JWICS, SIPRNet, and other classified network environments
Hands-on experience with Risk Management Framework (RMF) and NIST SP 800-53 control implementation
Proven experience managing Assessment & Authorization (A&A) activities for classified systems, including development of System Security Plans (SSPs), POA&Ms, and Security Control Traceability Matrices (SCTMs)
Experience applying and managing DoD STIGs and performing vulnerability mitigation on Windows and Linux systems
Familiarity with JSIG, ICD 705, and DoD/IC cybersecurity compliance standards
Experience working in or supporting SCIF/SAP/TS/SCI environments and understanding of their operational requirements
Experience with eMASS, ACAS, NESSUS, and other security compliance or vulnerability scanning tools
Demonstrated ability to interface with security personnel, program managers, and system/network engineers to ensure compliance
Experience responding to cybersecurity inspections, audits, or assessments by government agencies or customer security teams
Understanding of cross-domain solution requirements and secure data flow between classified systems
Experience maintaining compliance with continuous monitoring and configuration management processes across multiple classified systems
Education:
Bachelor's degree in Cybersecurity, Information Assurance, or any other related field (Required). A master's degree in a related field is preferred.
Certification:
Must meet DoD 8570 IAM Level III or IAT Level III baseline certification requirements
Acceptable certifications include: CISSP, CASP+, CISM, or GSLC
ICD 705 TEMPEST or TSCM training/certification preferred
Compensation: At ISA, we celebrate your contributions, provide you with opportunities and choices, and support your total well-being. Our offerings include 401(k) matching, PTO, paid Federal holidays, Life Insurance, Medical, Dental and Vision insurance, FSA/HSA options, professional development opportunities, and work-life programs. Our annual review program acknowledges employees for exceptional performance and superior demonstration of our values. Full-time employees working at least 30 hours a week on a regular basis are eligible to participate in ISA's full benefit program. Part-time employees that do not meet the threshold are only eligible for select offerings, not inclusive of health benefits. We encourage you to learn more about our total benefits by visiting https://www.isallc.net/isahrdownloads.
Salary at ISA is determined by various factors, including but not limited to location, the individual's particular combination of education, knowledge, skills, competencies, and experience, as well as contract-specific affordability and organizational requirements. The salary range for this position varies dependent on years of experience, relevant certifications and education. Salary is just one component of ISA's total compensation package for employees.
Anti-Discrimination Statement: All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, transgender status, and sexual orientation), national origin, age (40 or older), disability, genetic information, or status as a protected veteran.
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Location:
Arlington, VA, United States
Job Type:
PartTime
Category:
Computer And Mathematical Occupations

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