Information Systems Security Engineer (ISSE)

Information Systems Security Engineer (ISSE)

Location


US-VA-Chantilly

ID


2026-8613

Category


Information Technology

Position Type


Full-Time

Remote


No

Clearance Level


TS/SCI FS Poly

Description

Markon is seeking an Information Systems Security Engineer (ISSE) to support an Intelligence Customer in Chantilly, VA. This role provides cybersecurity and systems security engineering expertise to protect mission-critical information systems and ensure compliance with applicable Intelligence Community security requirements. The ISSE will assess system architectures, identify and mitigate vulnerabilities, support authorization activities, and collaborate with technical and mission stakeholders to integrate security throughout the system lifecycle.

Responsibilities

Technical cybersecurity role responsible for designing and embedding security controls into system architectures
• Ensure scans for all systems are run on a routine basis and work with system administrators/developers to patch vulnerabilities and policy failures
• A&A -review and complete required technical documentation (Accounts Management Plan, SOPs, etc.)
• Understanding of computer architecture, networking, operating systems, and network security
• Work with ISSMs to resolve any issues
• Develop, implement, and/or integrate Information Assurance (IA) and security systems, including those for networking, computing, virtualization, cloud, and enclave environments, to include those with multiple enclaves and with differing data protection/classification requirements.
• Review and conduct technical security assessments of computing environments to identify points of vulnerability, non-compliance with established Information Assurance (lA) standards and regulations, and recommend mitigation strategies.
• Create and review Assessment and Authorization (A&A) Body of Evidence documentation and provide feedback on completeness and compliance of its content.
• Advise and assist the Sponsor's customers with the Lifecycle Assessment and Authorization process.
• Ensure all program activities maintain system baselines and configuration management items, including security event monitoring policies, in a manner determined and agreed to by the COTR and the Sponsor's management.
• Ensure changes are made using the Sponsor's approved cybersecurity approval process and are coordinated and scheduled.
• Maintain appropriate levels of documentation deemed acceptable by Agency regulations and guidelines for each individual project, including operations and maintenance information, operations guides, design documents, scans, and overall concepts of operations.
• Enforce the design and implementation of trusted interfaces among external systems and architectures.
• Utilize COTS/GOTS and custom tools in order to scan, identify, contain, mitigate and remediate vulnerabilities and intrusions.
• Protect information and information systems from unauthorized access, use, disclosure, disruption, modification, perusal, inspection, recording and destruction.
• Recognize potential, successful, and unsuccessful intrusion attempts and compromises thorough reviews and analyses of relevant event detail and summary information.

Qualifications

Required:

• An active TS/SCI Full Scope Poly Security Clearance (Preferrably from this client)
• Bachelor's Degree in Cybersecurity, computer science, or related field
• 8+ years of experience supporting highly secure cybersecurity systems, including ATO processing, A&A documentation, networking operations, and security control analysis/remediation
• Experience supporting highly secure, enclaved environments
• High familiarity with IA concepts, SCA analysis process, and Cybersecurity policies such as NIST, FISMA, and RMF

Desired:

• Current CISSP, CISM, or CASP is preferred
• Experience with cloud-based architectures
• Continual education and research on cybersecurity trends, methologies, and policies

Salary Range

USD $170,000.00 - USD $195,000.00 /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 Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, national origin, age, protected veteran status, or disability status. This job posting will remain open until the position is filled.

Benefits Offered : Medical, Dental, Vision, Life Insurance, Short-Term Disability, Long-Term Disability, 401(k) match, Flexible Spending Accounts, EAP, Training and Tuition Assistance, Paid Time Off, and Holidays