**Description**

Leidos is seeking an experienced Information Systems Security Engineer (ISSE) to lead the security architecture, design, and deployment of mission-critical applications across unclassified, classified, and corporate networks. This role is highly dynamic, requiring a security SME who can bridge network boundaries across DTRA, DIA, and corporate infrastructures leveraging AWS multi-region and hybrid cloud environments. The ideal candidate will design robust Cross Domain Solutions (CDS) and ensure compliant application deployments across multiple government and commercial domains.

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**Key Responsibilities**

+ Cross Domain Architecture: Design, integrate, and test Cross Domain Solutions (CDS) allowing secure, policy-compliant data transfers and multi-level data sharing between unclassified and classified environments.
+ AWS Cloud Security: Engineer and maintain secure application architectures within AWS (Commercial, GovCloud, and Secr...