Information System Security Engineer (ISSE)

NS2 Mission
United States, Virginia, Tysons
Dec 02, 2025
The Information Systems Security Engineer (ISSE) supports the NS2 Mission is looking for an ISSE supporting our team in Tysons, VA. In this role you will be defining, implementing, and maintaining robust cybersecurity and information assurance (IA) requirements across mission systems. This role advises leadership and technical teams on security standards, oversees A&A/ATO activities, leads automated security testing efforts, and ensures the confidentiality, integrity, and availability of mission data. The ISSE serves as a key liaison between the Program Manager, engineering teams, and the Sponsor's security organizations. Responsibilities Serve as the lead for automated security testing, leveraging the Sponsor's enterprise scanning tools. Create and deliver Monthly Vulnerability Scans, ensuring accuracy, completeness, and timely submission. Prepare and deliver Monthly Privileged Users and Administrator Reports, validating access and ensuring compliance. Act as the overall lead for ensuring system security, protecting sensitive data and enforcing strict need-to-know principles. Collaborate with technical teams to develop, update, and track Plan of Action and Milestones (POAMs). Support the Program Manager (PM) in developing and maintaining the Contract Security Plan. Coordinate with the PM, the Sponsor's Information System Security Manager (ISSM), and the INFOSEC Program Council as required. Author, update, and maintain the program's System Security Plan (SSP) to support the Accreditation & Authorization (A&A) process. Develop and deliver required security education, training, and awareness materials to the Sponsor. Author and maintain the program's Automated Information Systems (AIS) Plan. Required Qualifications Demonstrated experience with application security standards, processes, and best practices. Hands-on experience with Accreditation & Authorization (A&A) activities, including documentation, POAM development, tracking, and remediation. Knowledge of application and data security requirements supporting Authority to Develop (ATD) and Authority to Operate (ATO) processes, including encryption, monitoring, auditing, reporting, and role-based access controls. Experience leading or supporting automated security testing, including vulnerability scanning and report delivery. Proven ability to partner with engineering teams to translate, implement, and validate security requirements. Experience supporting IA documentation such as System Security Plans (SSPs) and AIS Plans. Familiarity working within Agile/Scrum development environments. Position Clearance Requirement: Active TS/SCI with polygraph Please be aware many of our positions require the ability to obtain or maintain a U.S security clearance which requires U.S citizenship. We win with inclusion NS2 Mission's culture of inclusion, focus on health and well-being, and flexible working models help ensure that everyone - regardless of background - feels included and can run at their best. At NS2 Mission, we believe we are made stronger by the unique capabilities and qualities that each person brings to our company, and we invest in our employees to inspire confidence and help everyone realize their full potential. We ultimately believe in unleashing all talent and creating a better world. NS2 Mission is committed to the values of Equal Employment Opportunity and provides accessibility accommodations to applicants with physical and/or mental disabilities. If you are interested in applying for employment with NS2 Mission and are in need of accommodation or special assistance to navigate our website or to complete your application, please send an e-mail with your request to Recruiting Operations Team: NS2Mission.Careers@sapns2.com. Qualified applicants will receive consideration for employment without regard to their age, race, religion, national origin, ethnicity, age, gender (including pregnancy, childbirth, et al), sexual orientation, gender identity or expression, protected veteran status, or disability, in compliance with applicable federal, state, and local legal requirements.