Senior Network Architect (El Segundo, CA)

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. Bachelor’s degree in Engineering, Computer Science, Information Systems, Cybersecurity, or related technical field. Highly Desired SIPRNET / NIPRNET architecture experience. Arista and spine-leaf architecture. SD-WAN architecture and implementation. 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 QUALITY: GreenDart is committed to quality throughout all our efforts, as defined in our Quality Policy and implemented in our Quality Management System. #J-18808-Ljbffr GreenDart Incorporated