Senior System Architect, DoD Cross-Domain & Cloud Security

SITEC Consulting, LLC.; Springfield (VA); On-site; USD 160,000 - 210,000; Full time

Job summary

SITEC Consulting, LLC. seeks an experienced System Architect - Enterprise Cross Domain Systems (ECDS) to lead architecture, modernization, and integration of complex DoD enterprise environments. You will guide engineering teams across cybersecurity, cloud, and on-prem architectures while aligning to RMF/ATO processes.

The role requires hands-on depth, strong communication with stakeholders, and the ability to translate mission requirements into scalable, future-state designs.

Qualifications

• Active TS/SCI clearance and ability to obtain polygraph.
• 6+ years of technical experience in system/enterprise architecture, cybersecurity engineering, or related disciplines.
• Experience designing, integrating, or modernizing complex enterprise systems, preferably DoD or IC environments.
• Experience with multi-component infrastructure, network, security, and cloud elements.
• Strong understanding of enterprise networking, cybersecurity architecture, compute, storage, transport, and system integration.
• Experience with Windows and Linux server environments.
• Knowledge of enterprise cybersecurity technologies (NDR, EDR, NGFWs, IDS/IPS, F5, etc.).
• Experience developing architecture diagrams, designs, interfaces, roadmaps, and test strategies.
• Ability to communicate complex technical concepts to engineers and leadership.
• Ability to lead architecture activities with limited direction.
• Certification alignment for IAT Level III and IASAE Level II.
• Ability to obtain CSSP-Analyst certification within 120 days if applicable.

Responsibilities

• Develop and maintain system, enterprise, and solution architectures for Cross Domain Systems and cybersecurity capabilities.
• Analyze mission, operational, security, and technical requirements into architecture designs and interfaces.
• Define current/transition/target-state architectures for modernization of complex environments.
• Design solutions across on-premises, cloud, Windows/Linux, networking, cybersecurity, and cross-domain environments.
• Develop architecture artifacts: diagrams, data flows, interface docs, standards, roadmaps, and test plans.
• Define interfaces, dependencies, security boundaries, information flows, and integration requirements.
• Evaluate technologies and recommend solutions based on mission, cybersecurity, scalability, and lifecycle.
• Provide architectural guidance for integrating cybersecurity technologies (NDR/EDR, NGFW, IDS/IPS, F5, etc.).
• Support AWS services like EC2, EBS, ELB, S3, RDS.
• Provide technical direction to engineering teams on deployment and sustainment.
• Review infrastructure changes for architectural compatibility and risk.
• Support modernization, migrations, and legacy system transitions.
• Identify risks, constraints, and capacity needs with mitigations.
• Support RMF/ATO activities and coordination with government stakeholders.
• Collaborate with engineers, security personnel, and government stakeholders to meet requirements.
• Lead design reviews and architecture discussions with stakeholders.
• Serve as technical/architecture lead for capabilities or projects.

Skills

System architecture

Enterprise architecture

Cybersecurity engineering

Systems engineering

Network engineering

Windows/Linux servers

Clearance TS/SCI

Technical leadership

DoD environments

Education

DoD 8140/8570 alignment

CSSP-Analyst certification

Job description

SITEC Consulting, LLC. seeks an experienced System Architect - Enterprise Cross Domain Systems (ECDS) to lead architecture, modernization, and integration of complex DoD enterprise environments. You will guide engineering teams across cybersecurity, cloud, and on-prem architectures while aligning to RMF/ATO processes.

The role requires hands-on depth, strong communication with stakeholders, and the ability to translate mission requirements into scalable, future-state designs.