System Architect

Si Tec Consulting; Springfield (VA); On-site; USD 140,000 - 190,000; Full time

Job summary

SITEC Consulting seeks an experienced System Architect to support Enterprise Cross Domain Systems (ECDS) within a mission-critical DoD environment. You will lead the design and modernization of cross-domain capabilities, cybersecurity infrastructure, networks, and cloud environments, while providing technical direction to engineering teams.

The role requires hands-on depth to evaluate implementations, define future-state solutions, and guide modernization activities in collaboration with

Qualifications

• Active TS/SCI clearance with the ability to obtain a polygraph.

Responsibilities

• Develop and maintain system, enterprise, and solution architectures for Enterprise Cross Domain Systems (ECDS).
• Translate mission and technical requirements into architecture designs, interfaces, and implementation strategies.

Skills

TS/SCI clearance

6+ years experience

Cross-domain CDS

Windows/Linux

Enterprise architecture

Technical leadership

Tools

AWS

Security gateways

NDR/EDR/NGFWs

Job description

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.

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.

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.

REQUIRED QUALIFICATIONS

• Active TS/SCI clearance with the ability to obtain a polygraph.
• 6+ years of relevant technical experience supporting system architecture, enterprise architecture, cybersecurity engineering, systems engineering, network engineering, or related disciplines within complex enterprise environments.
• Demonstrated experience designing, integrating, or modernizing complex enterprise systems, preferably within DoD, Intelligence Community, or other classified environments.
• Experience developing system or solution architectures involving multiple infrastructure, network, security, application, or cloud components.
• Strong understanding of enterprise networking, cybersecurity architecture, compute, storage, transport, and system integration principles.
• Experience working with Windows and Linux server environments.
• Technical knowledge of enterprise cybersecurity technologies such as NDR, EDR, NGFWs, IDS/IPS, F5 platforms, security gateways, or comparable enterprise security capabilities.
• Experience developing architecture diagrams, technical designs, interface documentation, capability roadmaps, test strategies, or other engineering artifacts.
• Experience evaluating technology solutions and making architectural recommendations based on technical, operational, cybersecurity, and mission requirements.
• Ability to communicate complex technical concepts and architecture decisions to engineers, program leadership, government stakeholders, and senior decision‑makers.
• Ability to independently lead technical analysis and architecture activities with limited direction.
• DoD 8140.01 / 8570.01‑M certification alignment for IAT Level III and IASAE Level II, as required by the position.
• Ability to obtain required CSSP‑Analyst certification within 120 days of start date, if applicable to assigned duties.

PREFERRED QUALIFICATIONS

• Experience designing or supporting Cross Domain Solutions (CDS) or systems operating across multiple security domains.
• Experience supporting Enterprise Cross Domain Systems within DoD or Intelligence Community environments.
• AWS infrastructure or cloud architecture experience, including familiarity with EC2, EBS, ELB, S3, RDS, AMIs, networking, and cloud security concepts.
• Experience with hybrid on-premises/cloud architectures.
• Experience supporting RMF, ATO, security assessments, authorization activities, or external assessor coordination.
• Experience developing current‑state and future‑state architectures, transition roadmaps, architecture decision records, interface designs, or system‑of‑systems documentation.
• Experience providing technical leadership to multidisciplinary engineering teams.
• Experience supporting modernization of large‑scale, classified, mission‑critical, or globally distributed enterprise systems.