Senior Network Systems Engineer

About the role

We are seeking a Senior Network Systems Engineer to join our Global Network Services team. This role involves owning complex infrastructure end-to-end, from design and deployment through day-two operations and escalated troubleshooting, across a global, multi-region estate.

Responsibilities

• Own routing across the global routing estate — design, implement, and operate enterprise routing (BGP, OSPF), including internet edge, WAN, and inter-site connectivity.
• Engineer and operate the Cisco SD-WAN environment (Catalyst SD-WAN / Viptela) — policy design, template management, onboarding new sites, and troubleshooting overlay/underlay issues.
• Lead campus networking across the global office and lab footprint — access/distribution/core, wireless, and network access — delivering reliable, secure, high-performance connectivity.
• Resolve escalated operational issues (Tier 3/4) — act as the senior escalation point for complex incidents, driving root-cause analysis and permanent resolution.
• Deliver new site builds, refreshes, and migrations — produce designs, interconnect matrices, and cutover plans; coordinate with vendors and installation partners through delivery.
• Drive network changes through structured change control — plan, risk-assess, and execute changes with appropriate testing, validation, and rollback.
• Maintain operational health through observability — use network monitoring and telemetry tooling to detect, diagnose, and pre-empt issues before they impact users.
• Contribute to standards, runbooks, and documentation — raise the quality bar for how the team designs, operates, and hands off work.
• Mentor junior engineers and share expertise — act as a technical mentor and multiplier across the team.
• Support automation and modernisation — partner with automation/SRE colleagues to codify recurring tasks, moving the team from manual operations toward infrastructure as code.

Requirements

• Routing Expert-level knowledge of enterprise routing: BGP, OSPF, EIGRP, route redistribution, path selection, and policy-based routing.
• Hands-on experience operating routing on Cisco platforms (IOS-XE, ASR/ISR, Catalyst 8000) at enterprise scale.
• Strong grasp of internet edge, WAN, and DIA circuit design, including working with service providers on connectivity and troubleshooting.
• SD-WAN Deep expertise in Cisco SD-WAN (Catalyst SD-WAN / Viptela): control, management, and data plane; vManage/Catalyst Manager, vBond, vSmart.
• Proven experience with SD-WAN policy design, template configuration, site onboarding, and overlay/underlay troubleshooting.
• Understanding of transport-independent design across MPLS, broadband, and cellular, with application-aware routing and QoS.
• Networking Expert knowledge of campus LAN architecture: access/distribution/core, Layer 2/Layer 3 design, spanning tree, VLANs, and first-hop redundancy (HSRP/VRRP).
• Strong experience with Cisco campus switching (Catalyst 9000 series) or Juniper Switching.
• Expertise in enterprise wireless — design, deployment, and troubleshooting of Cisco wireless (WLC, Catalyst/Meraki or Juniper Mist access points), RF planning, and roaming.
• Familiarity with network access control and segmentation (Cisco ISE, 802.1X, TACACS+/RADIUS).
• Significant hands-on experience (typically 8+ years) in enterprise network engineering and operations, including a senior or lead technical role.
• Demonstrated ownership of complex, high-impact network infrastructure in a global environment.
• Strong troubleshooting discipline and structured incident-resolution skills under pressure.
• Excellent communication skills, with the ability to work across regions and mentor others.

Compensation

The target salary range for this position is 147,900 - 220,000 USD. The salary offered will be determined by the candidate's location, qualifications, experience, and education and may be outside of this range. The range is based on 'On Target Earnings' (OTE) representing the total potential earnings, which is the sum of the base salary and potential commission earned when performance targets are achieved. Final compensation packages are competitive and in line with industry standards, reflecting a variety of factors, and include a comprehensive benefits package. This may cover Health Insurance, Life Insurance, Retirement or Pension Plans, Paid Time Off, various Leave options, employee stock purchase plan, and/or restricted stocks (RSU’s). These offerings are subject to regional variations and governed by local laws, regulations, and company policies.