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Added 20 hours ago
IG
Secret Cross Domain Solutions Engineer
Insight Global
Aberdeen Proving Ground, MD
- From $82 USD / hour
o Insight Global is looking for a Cross Domain Solutions Engineer for a client in Aberdeen, MD. This person will spend their day engineering, integrating, testing, and troubleshooting Cross…
Added 20 hours ago
Information Systems Security Engineer (ISSE) Linux/RHEL
CACI International
Sterling, VA
Job Title: Information Systems Security Engineer (ISSE) Linux/RHEL
Added 21 hours ago
AS
Information System Security Engineer (ISSE)
AMERICAN SYSTEMS
Colorado Springs, CO
- $31,533 USD / year
Ensure automated information system (AIS) and network nodes are operated, maintained, and
Added 1 day ago
Senior Cybersecurity Engineer / Information System Security Engineer (ISSE)
Seneca Holdings
BUFFALO, NY
…seeking a highly skilled and experienced Senior Cybersecurity Engineer / Information System Security Engineer (ISSE) to support cybersecurity engineering, security operations, vulnerability…
Added 1 day ago
Cyber Security Engineer_ISSE
BAE Systems
Sterling, VA
Experience drafting and coordinating IT System Cyber Security & Incident Response Plans
Added 1 day ago
Information Systems Security Officer
Actalent
Annapolis, MD
Serve as an Information Systems Security Engineer (ISSE) for DoD software projects, providing cybersecurity leadership and guidance across the full system lifecycle.
Added 1 day ago
Information Systems Security Engineer
Actalent
Columbia, MD
Serve as an Information Systems Security Engineer (ISSE) for DoD software projects, providing cybersecurity leadership and guidance across the full system lifecycle.
Added 1 day ago
Senior Systems Engineer
Omitron, Inc.
Colorado Springs, CO
Work with the Information System Security Manager (ISSM) and Information System Security Engineer (ISSE) to build security into the design from the start.
Added 2 days ago
IASE / ISSE
Leidos
Suitland, MD
Information Assurance Security Engineer (IASE) / Information Systems Security Engineer (ISSE)
Added 2 days ago
Senior Information System Security Engineer
MANTECH
Remote, United States
MANTECH seeks a motivated, career and customer-oriented Senior Information System Security Engineer (ISSE) to join our team in Norfolk, VA. This is a remote position.
Added 2 days ago
Junior Information Systems Security Engineer
MANTECH
Eglin AFB, FL
MANTECH seeks a motivated, career and customer-oriented Junior Information Systems Security Engineer (ISSE) to join our Air Force / Space team at Eglin AFB.
Added 2 days ago
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Senior Information System Security Engineer (ISSE)
Amentum
Crane, IN
- $100,000 to $150,000 USD / year
Amentum is seeking a Senior Information System Security Engineer (ISSE) to support Program Offices within Department of War Strategic Systems Programs (SSP). The ISSE will support…
Added 2 days ago
Information Systems Security Engineer
GD Information Technology, Inc.
Remote, United States
Seize your opportunity to make a personal impact as a Information Systems Security Engineer (ISSE). We are seeking a highly skilled Information Systems Security Engineer with over 5 years…
Added 2 days ago
Information Systems Security Engineer (ISSE) Linux/RHEL
CACI
Sterling, VA · Sterling
Job Title: Information Systems Security Engineer (ISSE) Linux/RHEL
Added 2 days ago
Information Systems Security Engineer (ISSE) Linux/RHEL
CACI, INC.-FEDERAL
Sterling, VA
Job Title: Information Systems Security Engineer (ISSE) Linux/RHEL
Added 3 days ago
SkillBridge - Sr. Principal Cyber Systems Engineer
Northrop Grumman
San Diego, CA
Prepare, review, and defend accreditation packages as an Information Systems Security Engineer (ISSE) or Information Systems Security Manager (ISSM).
Added 3 days ago
Sr Systems Security Engineer
Sierra Nevada Corporation
Lone Tree, CO
Information Systems Security Engineer Certified Authorization Professional (ISSE CAP), Certified Information Systems Security Professional (CISSP), or Certified Information Security Manager…
Added 3 days ago
Information System Security Engineer (ISSE)
Lockheed Martin
Hanover, MD · MD · Elkridge
In this role, you're responsible for performing or reviewing technical security assessments of computing environments to identify points of vulnerability, non-compliance with established…
Added 3 days ago
Information System Security Engineer
Bering Straits Native Corp
Colorado Springs, CO
· Serve as the Information System Security Engineer (ISSE) responsible for integrating cybersecurity and information assurance requirements into the design, development, implementation, and…
Added 3 days ago
Information System Security Engineer (ISSE)
Interactive Process Technology LLC
Wright-Patterson AFB, OH
Support eMASS and Xacta workflows and use security information and event management, vulnerability-management, compliance, and authorization platforms to assess and report system status.
Added 3 days ago
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Information Systems Security Engineer
Markon
McLean, VA
- $175,000 to $205,000 USD / year
Markon is seeking an experienced Systems Engineer specializing in Information Systems Security Engineering (ISSE) and Data Engineering to support an Intelligence Community client in…
Added 3 days ago
Information Systems Security Engineer – Quantico (TS/SCI)
Praescient Analytics
Quantico, VA
Praescient Analytics is seeking an Information Systems Security Engineer – Senior (ISSE Senior) to support a high-profile federal law enforcement agency's Information Security as a Service…
Added 3 days ago
AS
Information Assurance and Security Engineer
AMERICAN SYSTEMS
Middletown, RI
- $79,000 to $126,400 USD / year
We are seeking an experienced Information Systems Security Engineer (ISSE) to provide cybersecurity engineering, systems engineering, and Test and Evaluation (T&E) support. The ISSE will…
Added 4 days ago
Senior FedRamp ISSO
MONTROSE ENVIRONMENTAL GROUP
SALT LAKE CITY, UT
…infrastructure for the AI era. At Cribl, we partner with IT and Security teams at many of the world's biggest enterprises, including half of the Fortune 100, to bridge the gap between AI…
Added 4 days ago
Principal Cybersecurity Engineer
Sabre Systems LLC
Patuxent River, MD
Sabre Systems seeking a Principal Cybersecurity Engineer to provide senior‑level Information System Security Engineering (ISSE) support for a federal cybersecurity program operating under…

Markon

Information Systems Security Engineer

McLean, VA, United States

$175,000 to $205,000 USD / year

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Job details

Pay: $175,000 to $205,000 USD / year
Apply by: Oct 28, 2027
Posting language: English
Posted: Oct 28, 2026

Original job description

Description

Markon is seeking an experienced Systems Engineer specializing in Information Systems Security Engineering (ISSE) and Data Engineering to support an Intelligence Community client in Chantilly, Virginia. This position will design, secure, integrate, and optimize mission-critical cloud and data solutions within classified environments, combining systems engineering principles, cybersecurity compliance, advanced analytics, and modern data engineering practices. The Systems Engineer will work across secure cloud architectures, ETL pipelines, graph databases, and AI/ML-supporting technologies to deliver scalable, compliant solutions aligned with mission requirements.

Responsibilities

Lead Information Systems Security Engineering (ISSE) activities throughout the system lifecycle, including security architecture development, security control implementation, and compliance with NIST and Sponsor-specific requirements.
Develop and maintain Assessment and Authorization (A&A) documentation supporting Authorization to Operate (ATO), including System Security Plans (SSPs), Plans of Action and Milestones (POA&Ms), test procedures, and continuous monitoring artifacts.
Conduct security scans, vulnerability assessments, patch management, and remediation activities across classified cloud and on-premises environments.
Integrate security-by-design principles into system architectures, data flows, ETL pipelines, and operational workflows.
Design, develop, and optimize Extract, Transform, Load (ETL) pipelines supporting enterprise data integration, advanced analytics, and AI/ML initiatives.
Develop and maintain Neo4j graph database solutions, including data modeling, relationship mapping, schema optimization, and Cypher query development.
Clean, preprocess, analyze, and visualize medium-to-large datasets to support mission analysis and operational decision-making.
Develop secure software components using technologies such as Cypher, Python, Java, and JavaScript.
Perform technical and functional assessments, risk analysis, cost estimation, trade studies, and systems engineering evaluations.
Support secure cloud architectures, virtualization technologies, and scalable data solutions within mission environments.
Collaborate with systems engineers, developers, security teams, and mission stakeholders to ensure solutions meet technical, accreditation, and operational requirements.
Participate in Agile development activities, including sprint planning, iterative development, and CI/CD processes.
Maintain comprehensive documentation covering technical requirements, data models, engineering decisions, software components, and security compliance.

Qualifications

Required:

Active TS/SCI clearance with Full Scope Polygraph (FSP).
Bachelor's degree and at least 8 years of relevant experience, including 2 years of Sponsor experience; OR
Master's degree and at least 6 years of relevant experience, including 2 years of Sponsor experience; OR
PhD and at least 3 years of relevant experience, including 2 years of Sponsor experience.
An additional 4 years of relevant experience may be considered in lieu of a degree.
Demonstrated experience designing, securing, and maintaining data flow solutions within classified or high-security environments.
Strong ISSE experience, including security architecture, A&A/ATO processes, vulnerability management, accreditation documentation, and continuous monitoring.
Hands-on experience developing ETL pipelines, data models, activity models, and data engineering solutions supporting AI/ML initiatives.
Proficiency in at least one programming language, such as Cypher, Python, Java, or JavaScript.
Experience with graph database technologies, with Neo4j and Cypher expertise preferred.
Experience cleaning, modeling, analyzing, and visualizing medium-to-large datasets.
Experience supporting Sponsor mission systems or classified programs.
Strong written and verbal communication skills with the ability to explain complex technical concepts to both technical and nontechnical stakeholders.

Desired:

Experience with enterprise data strategy, data governance, data stewardship, and metadata management.
Experience developing dashboards, technical visualizations, or system-level data representations.
Exposure to AI/ML and large language model (LLM) systems, including associated data engineering workflows.
Familiarity with Agile development methodologies and cloud-native architecture patterns.
Hands-on experience with Neo4j graph databases and advanced Cypher query development.

Salary Range USD $175,000.00 - USD $205,000.00 /Yr.The Markon pay range for this position is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

Overview

Eager to join a team where your skills are valued, your growth is nurtured, and your impact is profound? Look no further than Markon, a premier consulting firm deeply dedicated to advancing our nation's most critical missions.

At Markon, we don't just offer jobs – we offer opportunities for personal and professional transformation. Empowering our employees to lead, innovate, and excel, we foster an environment where new ideas are not just welcomed but celebrated. As a perennial Washington Post Top Workplace, we prioritize the well-being and success of our team members, ensuring they can bring their best selves to work.

Headquartered in Falls Church, Virginia, Markon has garnered national recognition for our unwavering dedication to excellence in serving the intelligence community, as well as federal civilian and defense agencies. Our growing reach extends across 17 states, 116 countries, and 5 continents, where our team of dynamic professionals collaborates to deliver unparalleled program and project management services.

Markon values people and the tremendous impact each individual can make – which is why we’re consistently recognized as one of the best places to work in federal government consulting. Here, you can help solve the nation’s most important challenges, surrounded by colleagues who help you grow, advance, and succeed. We are deeply dedicated to what matters – bringing out the best in each other to advance our clients’ missions.Join us and make a meaningful impact.

Markon is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status.

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More about this job

Skills

Data engineering
Engineering principles
Cybersecurity
Regulatory compliance
ML
Documentation
Test procedures
Design principles
Neo4j
Data modelling
Decision making
Python
Oracle Java
JavaScript
Estimating
Agile development
Iterative development
CI/CD
Data models
Cleaning
Communication skills

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