Senior Network Architect

El Segundo, CA | DoD / Space & Mission Networks | Active Clearance Required

Job Description:

GreenDart is seeking an accomplished Senior Network Architect to design, modernize, integrate, and secure mission‑critical network environments supporting high‑impact Department of Defense and space programs. This role requires a true enterprise‑level network architect — someone who has personally designed complex networks, solved difficult interoperability challenges, and supported secure classified infrastructure.

What You’ll Do:

• Architect and modernize complex enterprise, mission, and classified network environments.
• Own end‑to‑end network architecture across LAN/WAN, routing, switching, transport, segmentation, and secure communications.
• Design and troubleshoot advanced routing environments using BGP, OSPF, MPLS, IPv4/IPv6, multicast, VLANs, and QoS.
• Develop detailed network architectures, topology diagrams, configuration standards, and engineering documentation.
• Architect solutions using Cisco ASR/ISR/Nexus, Arista, and comparable enterprise networking platforms.
• Design and integrate SD‑WAN, spine‑leaf architectures, Zero Trust segmentation, and hybrid/cloud connectivity.
• Integrate network security technologies including Palo Alto, Fortinet, Cisco ASA, IDS/IPS, TACACS+, and secure access controls.
• Support and enhance classified network environments (SIPRNET, NIPRNET, and other mission networks).
• Conduct traffic, throughput, performance, and data‑flow analysis to optimize reliability and availability.
• Troubleshoot complex interoperability and system‑of‑systems issues and drive root‑cause resolution.
• Support architecture validation, technical design reviews, and modernization initiatives.
• Collaborate directly with government customers, cybersecurity teams, systems engineers, vendors, and program leadership.

Required Qualifications:

• 15+ years progressive network engineering/architecture experience in DoD, aerospace, intelligence, or mission‑critical environments.
• Demonstrated experience personally designing enterprise network architectures.
• Deep hands‑on expertise with BGP and OSPF.
• Strong enterprise Cisco routing and switching background.
• Experience with MPLS, LAN/WAN, IPv4/IPv6, VLANs, multicast, QoS, segmentation.
• Experience designing or supporting secure/classified network environments.
• Strong knowledge of network security, Zero Trust, STIG compliance, and infrastructure hardening.
• Proven ability to develop architecture documentation and communicate complex designs to diverse stakeholders.
• Strong troubleshooting and root‑cause analysis capabilities.
• Experience collaborating with DoD/government customers and multidisciplinary engineering teams.
• Active Secret clearance required
• Bachelor’s degree in Engineering, Computer Science, Information Systems, Cybersecurity, or related technical field.

Highly Desired:

• SIPRNET / NIPRNET architecture experience.
• Cisco ASR, ISR, Nexus 9000/9300.
• Arista and spine‑leaf architecture.
• SD‑WAN architecture and implementation.
• Palo Alto, Fortinet, Cisco ASA experience.
• Network automation (Ansible or similar).
• Cloud/hybrid network architecture (Azure/AWS).
• Secure communications, COMSEC, VoIP, VTC.
• Experience with DoD space, satellite, ground systems, SATCOM, C2, mission networks.
• System‑of‑systems integration, interoperability, network modeling, and data‑flow analysis.

Travel:

Travel may be required to sites located across the United States

Salary Range:

$96,352 - $206,189

Clearance:

Secret Clearance

QUALITY: GreenDart is committed to quality throughout all our efforts, as defined in our Quality Policy and implemented in our Quality Management System.

Pay: $96,352.00 - $206,189.00 per year

Benefits:

• Health insurance

Education:

• Bachelor's (Required)

Security clearance:

• Secret (Preferred)

Work Location: In person