Senior Field Network Engineer - ITS Infrastructure

Job Type: ContractCompany OverviewPrime Source Technologies, LLC (PST) delivers innovative IT program management, system integration and network engineering solutions to government agencies. We specialize in managing complex mission-critical projects that demand high availability and robust security protocols. Join our team to drive impactful modernization initiatives and optimize infrastructure performance for the District of Columbia. We provide a collaborative environment that values technical excellence and strategic problem-solving.Role OverviewWe are seeking a hands-on Senior Field Network Engineer to lead technical operations within the Intelligent Transportation Systems (ITS) program for the District Department of Transportation (DDOT). This strategic role directs the design, deployment and day-to-day administration of a highly available ITS network. You will connect traffic signals, video surveillance systems and IoT devices across the District. The architecture leverages Metro Ethernet services as the transport underlay and a Cisco DMVPN secure overlay to link distributed field sites to headend facilities.This position demands a focus on uptime, safety and reliability in mission-critical environments. You will split your time between field deployments and datacenter operations to maximize network performance. We need a technical leader who can independently troubleshoot complex routing anomalies and optimize end-to-end transport connectivity.Key ResponsibilitiesDMVPN & Secure Overlay Networking

• Deploy and support Cisco DMVPN (Phase 2/Phase 3) hub-and-spoke and spoke-to-spoke overlay networks across Metro Ethernet transport.
• Configure and troubleshoot IPsec VPN profiles, GRE tunnels, NHRP mappings and tunnel interfaces for the DMVPN fabric.
• Implement dynamic routing protocols (BGP, OSPF, EIGRP) over DMVPN tunnels to support automated failover and optimal path selection.
• Design failover and redundancy strategies including LTE/5G backup paths to maintain uninterrupted connectivity during circuit outages.

Metro Ethernet & WAN Transport

• Coordinate with service providers on Metro Ethernet circuit provisioning (E-Line, E-LAN), turn-up and incident resolution.
• Manage dual-WAN redundancy models and carrier handoff configurations at each designated field site.
• Execute field installations and cutovers of routers, switches, cabinets and handoff equipment.

Network Engineering & Operations

• Manage VLAN configurations, IP addressing schemes and Layer 2/Layer 3 connectivity between remote aggregation points and data centers.
• Implement network segmentation using VRFs, VLANs and firewall policies to isolate diverse ITS traffic domains.
• Apply QoS policies to prioritize latency-sensitive traffic such as signal control systems and video surveillance.
• Troubleshoot network issues end-to-end from the field site through the WAN transport directly to the data center.

ITS Infrastructure Support

• Support traffic signal control systems, CCTV platforms and IoT field devices by guaranteeing reliable low-latency transport connectivity.
• Coordinate field cabinet upgrades to accommodate new network equipment alongside power and environmental requirements.
• Drive the migration of remote aggregation points from legacy infrastructure to modern DMVPN-based transport mechanisms.
• Monitor network performance, availability and service-level compliance across all ITS transport links.

Security & Compliance

• Verify all network connections utilize encrypted communications per District government security mandates.
• Administrate VPN certificate lifecycles, key rotation and trust domain configurations.
• Implement rigorous IoT security and segmentation best practices for all field-deployed devices.
• Execute security audits, vulnerability assessments and remediation efforts on the ITS network infrastructure.

Do you have a valid Driver’s License license?, Do you have experience in Technical writing within technology?, Do you have a Bachelor’s degree?, Work Environment & Physical DemandsThis role requires a dynamic combination of street-level field work, data center operations and remote support. You must possess a valid driver’s license to travel to field locations across the District. Physical capability to lift and rack network equipment weighing up to 50 lbs is mandatory. You will participate in scheduled maintenance windows and provide on-call availability for after-hours emergency response scenarios.

Education: Bachelor’s degree in Computer Science, IT, Network Engineering or related field15 Years (or equivalent professional experience)

Communication: Conveying technical and functional concepts for a specific technical specialty - 11 Years

Documentation: Preparing complex technical documentation - 11 Years

ITS Expertise: Intelligent Transportation Systems (traffic signal controllers, CCTV transport) - 11 Years

Automation: Network automation skills using Ansible or Python-based scripting- 11 Years

Fiber Optics: Single-mode fiber design and SFP/SFP+ transceivers - 11 Years

Public Sector: Prior experience working with a state or municipal Department of Transportation - 10 Years

Network Architecture: High-availability network design and disaster recovery planning - 8 Years

Wireless Backup: Experience with LTE/5G failover solutions - 7 Years

Security: Knowledge of IoT security and network segmentation best practices - 5 Years

Certifications: Active Cisco Certified Network Associate (CCNA) Required

Highly Desired Qualifications

• Cisco Certified Internetwork Expert (CCIE) Enterprise Infrastructure
• Certified Fiber Optic Technician (CFOT) or equivalent
• CompTIA Network+ or Security+
• ITIL v4 Foundation Certification

Pulled from the full job description

• Referral program
• Professional development assistance
• Tuition reimbursement
• Parental leave
• 401(k)
• Health insurance
• Retirement plan, * 401(k)
• 401(k) matching
• Dental insurance
• Employee assistance program
• Employee discount
• Flexible spending account
• Health insurance
• Health savings account
• Life insurance
• Paid time off
• Parental leave
• Professional development assistance
• Referral program
• Retirement plan
• Tuition reimbursement
• Vision insurance