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