Information Systems Security Engineer (ISSE)

The AEGIS program at Leidos is seeking an experienced Information Systems Security Engineer (ISSE) to support the security and protection of NASA Advanced Supercomputing (NAS) systems and High Performance Computing (HPC) environments.

The ISSE will support the development, documentation, implementation, enhancement, operation, and maintenance of comprehensive System Security Plans (SSPs) across NAS systems, clusters, interconnects, storage platforms, and data resources.

This role will help ensure security documentation, configuration baselines, security checklists, and system hardening guidelines align with applicable security requirements while addressing the unique performance, throughput, and operational demands of HPC environments.

PRIMARY RESPONSIBILITIES

• Ensure that the SSP and related artifacts comply with NASA and U.S. Government security requirements, including NPR 2810.1F, NIST 800-53/53B, FISMA, and the NIST HPC Security Overlay guidance.
• Provide expert technical consultation for internal and external stakeholders on HPC‑specific security issues, including system hardening for MPI‑based workloads, GPU/accelerator nodes, high‑speed fabrics (InfiniBand, Slingshot), and performance‑critical parallel filesystems.
• Identify solutions that balance high‑performance computing usability with robust security ensuring that protective measures do not inhibit large‑scale simulation workflows, mission operations, or research productivity.
• Provide regular HPC‑specific data analytics and reporting - including vulnerability summaries, risk evaluations, security telemetry, and compliance findings - to Division and Branch leadership.
• Support Plan of Action and Milestones (POA&M) development, tracking, updating, and remediation for all HPC systems.
• Coordinate POA&M resolution activities across HPC systems engineering, networking, storage, and operations teams.
• Conduct targeted compliance assessments for large-scale HP