Network Engineer

Job Title :
Senior Network Engineer – Cisco Catalyst/Nexus (CCNP Required)

Position Overview Take ownership of enterprise and data center network reliability in a hands-on senior engineering role focused on Cisco networking, complex troubleshooting, and continuous infrastructure improvement. You will support and maintain Cisco Catalyst and Nexus switching platforms, routing, and perimeter connectivity while serving as a Tier 3 escalation point for critical network incidents. This role is suited to an experienced network engineer who can independently resolve complex Layer 2/3 issues, execute controlled network changes, and maintain a stable, secure, and high-performing production environment.

What You'll Do /

Key Responsibilities Operate, monitor, and maintain enterprise LAN, data center, and perimeter networks using Cisco Catalyst and Nexus platforms. Serve as the Tier 3 escalation point for switching, routing, fiber, and firewall connectivity incidents, leading troubleshooting and root-cause analysis. Configure and support VLANs, trunking, Spanning Tree Protocol (STP), vPC, port-channels, SVIs, and dynamic routing protocols, including OSPF, EIGRP, and BGP. Perform network moves, adds, and changes, firmware upgrades, and hardware replacements through formal change management processes and scheduled maintenance windows.

Collaborate with security teams on firewall interfaces, network segmentation, and access controls. Maintain Layer 2 security and management plane hardening. Monitor network performance and capacity, identify bottlenecks, and resolve issues before they affect users. Install and troubleshoot fiber optic connections and transceivers, coordinating with facilities and cabling teams as needed. Maintain accurate network documentation, including topology diagrams, IP/VLAN registers, configuration standards, and operational runbooks.

Participate in the on-call rotation and mentor junior engineers.

Required Qualifications Active Cisco CCNP certification in Enterprise or Data Center is mandatory. Candidates without a current CCNP certification will not be considered. 8+ years of enterprise or data center network engineering experience. Expert-level knowledge of Cisco Catalyst and Nexus platforms and Layer 2/3 switching, including VLANs, STP, vPC, LACP, SVIs, OSPF/EIGRP/BGP, and first-hop redundancy protocols such as HSRP/VRRP. Strong production network troubleshooting skills and the ability to perform effectively under pressure during outages.

Working knowledge of next-generation firewall (NGFW) integration, network segmentation, and Layer 2 security controls, including 802.1X, DHCP snooping, and Dynamic ARP Inspection (DAI). Hands-on experience with fiber optics, including SFP/QSFP transceivers, single-mode/multimode fiber (SMF/MMF), and Digital Optical Monitoring (DOM).

Experience with network monitoring and analysis tools such as Solar Winds, Wireshark, or similar platforms.

Experience with ITSM and change management processes using Service Now or similar tools. Strong documentation and communication skills. Ability to work full-time on-site in Ramsey, NJ, five days per week, and live within commuting distance of the site.

Preferred Qualifications Experience in healthcare, life sciences, or laboratory environments, including familiarity with HIPAA.

Experience with VXLAN/EVPN. Network automation experience using Python/Ansible.

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