System Architect

SITEC Consulting is seeking an experienced System Architect - Enterprise Cross Domain Systems (ECDS) to support the architecture, modernization, integration, and sustainment of complex enterprise systems within a mission-critical Department of Defense environment.

This position will provide technical leadership for the design and evolution of enterprise architectures spanning cross-domain capabilities, cybersecurity infrastructure, networks, Windows/Linux platforms, and cloud environments
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The ideal candidate is a senior technical professional who can evaluate existing environments, translate mission and technical requirements into scalable system architectures, define future-state solutions, and guide engineering teams through implementation and modernization activities.

This is an architecture-focused position requiring sufficient hands‑on technical depth to understand implementation challenges, evaluate technology solutions, resolve complex integration issues, and provide technical direction across multiple engineering disciplines.

• Develop and maintain system, enterprise, and solution architectures supporting Enterprise Cross Domain Systems and associated cybersecurity capabilities.
• Analyze mission, operational, security, and technical requirements and translate them into architecture designs, system requirements, interfaces, and implementation strategies.
• Define current‑state, transition‑state, and target‑state architectures for modernization of complex enterprise environments.
• Design solutions spanning on-premises infrastructure, cloud services, Windows/Linux platforms, networking, cybersecurity technologies, and cross-domain environments
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• Develop architecture artifacts including system diagrams, network and data‑flow diagrams, interface documentation, technical standards, implementation strategies, test plans, and capability roadmaps.
• Define system interfaces, dependencies, security boundaries, information flows, and integration requirements across enterprise environments.
• Evaluate existing and emerging technologies and recommend solutions based on mission requirements, cybersecurity, scalability, interoperability, performance, resiliency, and lifecycle considerations.
• Provide architectural guidance for the integration of enterprise cybersecurity technologies such as NDR, EDR, next‑generation firewalls, IDS/IPS, F5 platforms, and email/web security capabilities
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• Support architectures incorporating AWS services such as EC2, EBS, ELB, S3, RDS, and related cloud capabilities
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• Provide technical direction to engineering and implementation teams responsible for system deployment, configuration, integration, testing, and sustainment.
• Review proposed infrastructure, application, network, and security changes for architectural compatibility and technical risk.
• Support modernization efforts involving technology upgrades, infrastructure migrations, capability enhancements, and transition of legacy systems.
• Identify architecture‑level technical risks, constraints, dependencies, performance considerations, and capacity requirements and develop appropriate mitigation strategies.
• Support security assessments,
  RMF/ATO activities
  , authorization efforts, and coordination with government stakeholders and external assessors.
• Collaborate with systems engineers, cybersecurity engineers, network engineers, cloud engineers, software teams, security personnel, and government stakeholders to ensure solutions meet enterprise architecture and mission requirements.
• Lead technical exchanges, design reviews, architecture reviews, and engineering discussions with technical and senior‑level stakeholders.
• Serve as a technical lead or architecture lead for assigned capabilities, projects, or modernization…