Senior System Architect – Enterprise Cross-Domain (TS/SCI)

SITEC Consulting, LLC.; Springfield (VA); On-site; USD 140,000 - 190,000; Full time

Job summary

SITEC Consulting, LLC seeks an experienced System Architect to support Enterprise Cross Domain Systems (ECDS) in a DoD environment. You will lead architecture design across cross-domain capabilities, cybersecurity, networks, and cloud services, translating mission requirements into scalable solutions.

The role requires deep hands-on depth to guide engineering teams through modernization, with emphasis on architecture artifacts, risk management, and security compliance.

Qualifications

• Active TS/SCI clearance with the ability to obtain a polygraph.
• Demonstrated experience designing, integrating, or modernizing complex enterprise systems, preferably within DoD, Intelligence Community, or other classified environments.
• Experience developing architecture diagrams, technical designs, interface documentation, capability roadmaps, test strategies, or other engineering artifacts.

Responsibilities

• 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.
• 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.
• Support architectures incorporating AWS services such as EC2, EBS, ELB, S3, RDS, and related cloud capabilities.
• 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 initiatives as required.

Skills

TS/SCI clearance

Enterprise architecture

Cross-domain concepts

Windows/Linux experience

Strong communication

Education

Bachelor's degree in a related field

Tools

AWS

NGFW/IDS/IPS

F5 platforms

Job description

SITEC Consulting, LLC seeks an experienced System Architect to support Enterprise Cross Domain Systems (ECDS) in a DoD environment. You will lead architecture design across cross-domain capabilities, cybersecurity, networks, and cloud services, translating mission requirements into scalable solutions.

The role requires deep hands-on depth to guide engineering teams through modernization, with emphasis on architecture artifacts, risk management, and security compliance.