Senior Network Engineer, Network Operations

The Senior Network Engineer provides operational and engineering support for geographically distributed network infrastructure serving critical research and laboratory environments across the United States and Europe. This senior-level role owns day-to-day network operations, complex troubleshooting, implementation, lifecycle management, documentation, and onsite support. The engineer partners with infrastructure, security, facilities, telecommunications, and business teams to maintain reliable LAN, WAN, wireless, cloud, and hybrid network services. Travel of up to 25% may be required for domestic and international site support, deployments, and infrastructure upgrades., * Own operational support and technical resolution for network infrastructure across research, laboratory, facility, cloud, and partner environments.

• Serve as the primary engineering escalation point for network issues, escalating architecture, security, policy, and significant-risk decisions when appropriate.
• Troubleshoot Layer 2 and Layer 3 connectivity, routing, switching, wireless, VPN, firewall, ISP, DNS/DHCP, and network performance issues.
• Implement approved network changes in accordance with architecture, engineering standards, designs, and change-management procedures.
• Configure, deploy, maintain, upgrade, and troubleshoot Cisco Catalyst and Cisco Meraki infrastructure, including switches, wireless systems, optics, fiber, and high-speed Ethernet.
• Support WAN, inter-site, hybrid cloud, and facility connectivity, including coordination with carriers, vendors, security teams, facilities, engineering groups, and site personnel.
• Monitor network availability, health, capacity, and performance while leading incident response, service restoration, root-cause analysis, and corrective actions.
• Maintain network diagrams, configurations, IP addressing records, circuit inventories, equipment documentation, operational runbooks, standard operating procedures, and troubleshooting guides.
• Execute network lifecycle activities, including software and firmware upgrades, hardware replacement, configuration maintenance, technical debt remediation, and equipment refreshes.
• Identify opportunities to automate network operations and improve monitoring, configuration management, validation, documentation, and troubleshooting consistency.

• Advanced experience with Cisco routing and switching and strong knowledge of VLANs, trunking, STP, routing, ACLs, redundancy, and high-availability network design.
• Strong BGP and OSPF implementation and troubleshooting skills, including complex WAN and inter-site connectivity.
• Demonstrated packet-level troubleshooting experience using packet captures, flow data, device telemetry, Wireshark, or comparable tools.
• CCNP Enterprise certification or equivalent demonstrated enterprise networking experience.
• Extensive experience with Cisco Catalyst and Cisco Meraki Dashboard for switching, wireless, monitoring, troubleshooting, and security platforms.
• Working knowledge of Microsoft Azure networking or comparable cloud environments, including IPsec VPNs, BGP, virtual networking, network security controls, and hybrid connectivity; Azure Virtual WAN or similar cloud WAN experience is desirable.
• Enterprise wireless troubleshooting experience, including familiarity with 802.1X, certificate-based authentication, NAC/RADIUS, guest networking, and upstream network dependencies.
• Working knowledge of network segmentation, firewalls, ACLs, VPNs, Zero Trust principles, secure remote access, certificate-based authentication, and enterprise security and change-management requirements.
• Experience with PowerShell, Python, REST APIs, or equivalent network automation technologies; familiarity with structured configuration management and version control is desirable.
• Strong independent problem-solving, communication, organization, and documentation skills, with the ability to manage operational priorities and collaborate across U.S. and Central European time zones.