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# Core Network Engineer IOS

- **Company:** Cisco Systems, Inc.
- **Location:** United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Amazon Web Services, Apple IOS, Build Automation, Microsoft Azure, Border Gateway Protocol, Cloud Computing, Complex Networks, Wavelength-Division Multiplexing, IPv4, IPv6, Multi-protocol Systems, Python (Programming Language), Multicasting, Netconf, Routing, Open Shortest Path First (OSPF), Ansible, Wide Area Networks, Model-Driven Development, Git, Information Technology, Restful APIs, Terraform, Open Network Automation Platform, Cisco
- **Published:** September 4, 2026
- **Apply:** https://computerjobs.com/us/en/mob/job/8E059CA50AA5B42494

## About the Role

Senior Core Network Engineer IOS = MUST HAVE BANKING EXPERIENCE, * 10+ years' experience in large enterprise or service provider networking.

 * Strong Cisco IOS-XR experience.
 * Hands-on experience with Cisco 8000, ASR 9000, and NCS platforms.
 * Strong knowledge of:
 + MPLS
 + Segment Routing
 + BGP
 + ISIS
 + OSPF
 + EVPN
 + L2VPN/L3VPN
 + Multicast
 + QoS
 + IPv4/IPv6
 * Strong Cisco NSO experience.
 * Experience with Python, YANG, NETCONF, REST APIs, gNMI, and Git.
 * Experience with optical networking, DWDM, dark fibre, Metro Ethernet, and carrier services.

Desirable

 * CCNP or CCIE.
 * Terraform, Ansible, or Infrastructure-as-Code experience.
 * Cisco Crosswork exposure.
 * Cloud networking experience across AWS, Azure, or GCP.
 * SD-WAN or Arista experience.
 * Experience within financial services or other large regulated environments., A senior network engineer with deep Cisco IOS-XR and Cisco NSO expertise, proven experience delivering large-scale network migrations and upgrades, and a strong background in network automation and core infrastructure transformation.
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## Description

* Design, implement, and support large-scale WAN, MAN, and optical networks.
 * Lead core network migrations, software upgrades, hardware refreshes, and transformation programmes.
 * Produce low-level designs, migration plans, implementation procedures, and rollback documentation.
 * Provide technical leadership across complex network engineering projects.
 * Troubleshoot routing, forwarding, and control-plane issues in large production environments.
 * Develop and maintain Cisco NSO automation solutions.
 * Build automation using Python, YANG, NETCONF, REST APIs, and model-driven networking.
 * Support Infrastructure-as-Code, compliance, provisioning, and configuration automation.
 * Work closely with architecture, operations, vendors, and project teams.


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