Junior Information Systems Security Engineer

MANTECH seeks a motivated, career and customer-oriented Junior Information Systems Security Engineer (ISSE) to join our team in Virginia Beach, VA. This is a hybrid position with 2-3 days onsite and 2-3 days remote.

This critical role focuses on the full lifecycle of cybersecurity engineering, from initial system design to maintaining a Continuous ATO (cATO) posture through diligent Annual Security Reviews (ASRs).

Responsibilities include but are not limited to:

• Performing cyber security research under NAVSEA for cloud and network solutions

• Assist in identifying information protection needs and defining security requirements for Information Systems (IS) and Cloud Network Environments.

• Support the design of security architecture and the implementation of specific cybersecurity countermeasures.

• Assist in cyber incident reviews and reporting. Conduct onsite SIPR-based research to retrieve and analyze incident data classified at the Secret level.

• Assist in performing Interconnection Approval (IAP) requests, Boundary Change Requests (BCRs), Privacy Impact Assessments (PIA), and Ports, Protocols, and Services Management (PPSM).

• Participate in Authorization to Operate (ATO) efforts using RMF, NIST 800-series, and Navy-specific guidance.

• Assist with auditing and updating IL5 & IL6 eMASS instances, including inheritance, POA&M, hardware, software, DADMS, diagrams for Secure Cloud Computing Architecture and Cloud Hosting Environments.

• Lead self-assessments and STIG reviews to ensure system hardening compliance.

• Manage the annual security review of full ATO packages to ensure on-time submission, extending accreditation dates and maintaining the Continuous ATO model.

• Track tasks via GitHub, creating and maintaining metadata (milestones, projects, descriptions and board linkages).

• Collect and integrate the latest Navy guidance to ensure issue templates and security documentation r