SAIC is seeking a Software Systems Engineer to own full stack development and technical maturation of a government software prototype as it transitions from research/prototype status to a Program of Record (PoR) for our customer site in North Charleston, SC. Job Duties: • Resilient System Design: Develop distributed systems for secure, reliable operation in degraded, bandwidth-limited, and autonomous environments. • Full-Stack Development: Build and maintain backend services, frontend applications, and infrastructure, hardening prototypes to meet DoD security, scalability, and operational standards. • Data Security & Compliance: Implement secure data pipelines and protocols, ensure RMF compliance, support ATO accreditation, and follow secure development practices like container hardening and CI/CD security. • Networking & Integration: Design segmented networks, real-time communications, hardware integration, and modular deployments for mission-critical applications. • Operational & Mission Support: Create user-centric tools for tactical use, diagnostics, air-gapped provisioning, and deliver scalable, mission-aligned engineering solutions. Required Education and Experience: • Bachelors and five (5) years or more work experience; (4) four years of additional work experience accepted in lieu of degree. • Demonstrated proficiency in Go, Python. • Systems Integration Experience: Demonstrated ability to integrate heterogeneous hardware, communications links, containerized software services, and data pipelines into a unified, operationally deployable system. Preferably experience with multi-transport networking, pub/sub architectures, edge-to-cloud data federation, and API/protocol translation across diverse sensor or platform types. • Active, hands-on use of AI development tools (e.g., Claude Code, GitHub Copilot, Cursor, or similar AI coding assistants) as part of daily engineering work. • Practical experience with cybersecurity-conscious software engineering — secure coding practices, vulnerability remediation, container/infrastructure hardening, or similar. • Experience taking prototype/research-grade code and maturing it into a production, supportable system. Required Security Clearance: • Must be a US Citizen, no clearance required to start but must be able to obtain and maintain an active Secret clearance. Desired Qualifications: • Direct experience supporting an ATO package (SSP development, control implementation, POA&M management, eMASS). • Experience with containerization/orchestration (Docker, Kubernetes) and CI/CD pipeline security. • Familiarity with DoD software acquisition processes and prototype-to-Program-of-Record transitions. • Experience with cloud environments (AWS GovCloud or similar) in an accredited/compliance-driven context. • Prior experience in a DoD, IC, or other federal contracting environment. • Proficiency with React and Rust. • Familiarity with the general lifecycle of moving a system through security accreditation (RMF, ATO, or equivalent commercial/compliance frameworks), prior direct ATO experience is a strong plus but not mandatory.