Information System Security Engineer (ISSE) – Senior

About NDi

Network Designs, Inc. (NDi) is a leading Federal contractor that specializes in designing, developing, and delivering information technology and network solutions for government customers. Founded in 1985, NDi's firmly defined core values have driven all aspects of the business, which have been paramount to our company's success and the establishment of an enjoyable workplace atmosphere. At NDi, we believe that our people are the cornerstone of our success, and we value collaboration, career growth, and winning ideas. Military Veterans Encouraged to Apply.

Job Description

NDi is seeking an experienced Information System Security Engineer (ISSE) - Senior to provide senior-level security engineering support for enterprise information systems within a large federal IT services program.

The ISSE (Senior) serves as a technical authority responsible for supporting system owners and engineering teams in the design, implementation, and validation of security controls across complex information systems. This role supports Authorization to Operate (ATO) and ongoing authorization activities by applying FISMA, the NIST Risk Management Framework (RMF), and federal cybersecurity standards to ensure systems are secure, compliant, and operationally effective throughout their lifecycle.

Requirements

Requirements

• U.S. Citizenship is required
• Must possess an active Top Secret (TS) clearance at the time of application
• This position requires working onsite at one of the following locations, 5 days per week: Downtown Washington, DC; Huntsville, AL; or Clarksburg, WV

Qualifications And Experience

• Bachelor's degree in Computer Science, Information Systems, Cybersecurity, Engineering, or a related technical discipline; or equivalent combination of education, training, and work experience.
• Eight (8) or more years of progressive experience supporting federal information systems security engineering ; in absence of years of experience, certifications or past work may be used to show the level of experience needed to perform at this level.
• Demonstrated experience supporting information systems through the full RMF lifecycle, including initial authorization and continuous monitoring.
• Hands-on experience designing and implementing security controls aligned to NIST SP 800-53.
• Experience supporting systems categorized under FIPS 199 (Moderate and High), including National Security Systems (NSS), as applicable.
• Proven experience collaborating with system owners, architects, developers, and ISSOs to remediate technical security gaps and close POA&Ms.
• Experience supporting system security architecture, boundary definition, and technical control inheritance.
• Experience developing and maintaining RMF artifacts and supporting evidence within a Governance, Risk, and Compliance (GRC) tool environment.
• Certifications (preferred, not required)
• CISSP (Associate or Full)
• CISM
• GSLC
• Other senior-level cybersecurity or security engineering certifications aligned to RMF
• Strong expertise in information system security engineering and secure system design.
• In-depth knowledge of RMF and federal cybersecurity compliance requirements.
• Experience implementing and validating controls related to identity and access management, logging, vulnerability management, and configuration baselines.
• Ability to translate security requirements into actionable technical designs and implementation guidance.
• Strong documentation, analytical, and communication skills.
• Ability to operate effectively across large, multi-system enterprise environments.
• Ability to mentor mid- and junior-level security engineers

Responsibilities

Security Engineering & Architecture

• Provide senior-level security engineering support for enterprise information systems.
• Design, implement, and validate technical security controls to support ATO and ongoing authorization.
• Support development and review of system security architectures, boundaries, and control implementations.
• Advise system owners and technical teams on secure system design and remediation strategies.

RMF / Compliance Support

• Lead or support preparation and maintenance of RMF artifacts, including system security plans and control implementation descriptions.
• Support POA&M remediation and security impact analysis for system changes.
• Support continuous monitoring activities and recurring security reviews.
• Coordinate with assessment teams to resolve technical and documentation rework efficiently.

Collaboration & Technical Leadership

• Serve as a senior technical advisor on information system security risk and compliance.
• Collaborate with ISSOs, system engineers, and operations teams to ensure consistent and high-quality security implementation.
• Mentor junior engineering staff and support knowledge sharing.
• Contribute to process improvement initiatives focused on improving ATO quality, timeliness, and audit readiness

Compensation And Benefits

At NDi, we value our team and are committed to retaining top talent by offering competitive benefits and compensation packages. Our employee benefits package includes comprehensive health, dental, vision, pet, and legal insurance. Our corporate benefits include 401(k) retirement matching, paid leave, paid holidays, and health and wellness programs. In addition, we provide employer-paid life and disability insurance, professional development, education benefits, and much more to ensure our team has the resources they need to thrive on and off the job.

Veterans First** Commitment:**

As a Service-Disabled Veteran-Owned Small Business (SDVOSB), NDi is dedicated to hiring veterans and providing a supportive work environment that honors their service while recognizing the unique skills and experiences they bring to our organization.

Commitment To Diversity

NDi is an Equal Opportunity Employer. We are committed to creating a diverse environment and are proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran or military status, citizenship, national origin, or any other basis prohibited by law in all phases of the employment process and compliance with applicable federal, state, and local laws and regulations. As a federal government contractor, NDi complies with all applicable affirmative action requirements.

Apply Now: Take advantage of this unique opportunity to join one of the fastest-growing companies in Federal contracting!