Senior Network & Infrastructure Lead Engineer
Location: Hybrid, South London 
Job Type: Permanent

We’re looking for an experienced Senior Network & Infrastructure Lead Engineer to take technical ownership of a business-critical enterprise network and Nutanix infrastructure environment.
This is a hands-on senior engineering role for someone who enjoys solving complex technical problems, improving infrastructure and taking ownership of how technology performs across a large and distributed estate.

You’ll be the technical authority for enterprise networking and Nutanix infrastructure, working across architecture, engineering, troubleshooting, resilience and continuous improvement.
You’ll also work closely with technology partners, vendors and managed service providers, providing technical challenge and ensuring services are delivered to a high standard.
This isn't a general infrastructure management role. We’re looking for someone who remains close to the technology, leads by example and enjoys getting into the detail when required.

What You'll Be Doing

Network Engineering

• Take technical ownership of enterprise network services across LAN, WAN, wireless and remote connectivity.
• Design, implement and support resilient network solutions across a large multi-site environment.
• Work with routing and switching technologies including OSPF and BGP.
• Support SD-WAN, firewalls, VPNs, VLANs, DNS and DHCP.
• Lead troubleshooting of complex network and connectivity issues.
• Support branch, office, warehouse, data centre and remote-site connectivity.
• Improve network monitoring, alerting, visibility and capacity management.
• Lead network lifecycle, refresh and modernisation initiatives.
• Conduct root cause analysis following major incidents and recurring faults.
• Review technical designs, network changes and implementation plans.

Nutanix Infrastructure

• Take technical ownership of the organisation's Nutanix infrastructure platform.
• Administer and support Nutanix AHV clusters and Prism Central/Prism Element.
• Manage lifecycle activities, upgrades, patching and platform maintenance.
• Monitor and optimise performance, capacity, availability and resilience.
• Troubleshoot compute, storage, virtualisation and cluster-related issues.
• Develop and maintain technical standards, runbooks and operational procedures.
• Support backup, disaster recovery and business continuity requirements.
• Drive platform optimisation, standardisation and continuous improvement.

Technical Leadership & Suppliers

• Act as the senior technical escalation point for network and Nutanix-related issues.
• Lead technical troubleshooting during major incidents and drive effective service restoration.
• Work with vendors, MSPs and technology partners to resolve complex technical issues.
• Review supplier technical proposals, designs, implementation plans and changes.
• Challenge suppliers constructively around resilience, performance, security and permanent remediation.
• Monitor supplier performance, technical risks and outstanding improvement actions.
• Ensure internal technical knowledge and documentation remain strong, reducing dependency on third parties.

Continuous Improvement

• Define and maintain technical standards across networking and infrastructure.
• Improve resilience, stability, security and operational visibility.
• Identify opportunities for automation, simplification and standardisation.
• Maintain accurate network diagrams, configuration records, documentation and runbooks.
• Support disaster recovery testing and infrastructure resilience exercises.
• Communicate technical risks and recommendations clearly to both technical and non-technical stakeholders.

What We're Looking For
We’re looking for someone with significant experience operating in complex, highly available enterprise environments.

You'll ideally have:

• 8+ years' experience in enterprise infrastructure and networking.
• Strong hands-on enterprise network engineering experience.
• Extensive experience administering and supporting Nutanix environments.
• Strong knowledge of Nutanix AHV, Prism Central and Prism Element.
• Strong networking knowledge covering TCP/IP, routing, switching and VLANs.
• Experience with OSPF and BGP.
• Experience with SD-WAN, firewalls and VPN technologies.
• Experience supporting large, multi-site or distributed environments.
• Strong troubleshooting and root cause analysis skills.
• Experience leading technical resolution during major incidents.
• Experience designing resilient, highly available network and infrastructure solutions.
• Experience with monitoring, performance management and capacity planning.
• Strong technical documentation and operational runbook experience.
• Experience working with vendors, MSPs and external technology partners.

Experience of network modernisation, infrastructure transformation or large-scale technology refresh programmes would also be highly valuable.

What You'll Bring You’ll be someone who:

• Takes genuine ownership of technical outcomes.
• Enjoys remaining hands-on and technically involved.
• Can operate calmly and effectively during major incidents.
• Has excellent analytical and problem-solving skills.
• Thinks about resilience, security and long-term supportability rather than simply fixing today's problem.
• Can challenge suppliers and technical partners confidently.
• Communicates complex technical issues clearly.
• Enjoys improving infrastructure rather than simply maintaining it.
• Leads through technical expertise, collaboration and example.

Why This Role?
This is an opportunity to take real technical ownership of a critical enterprise environment.
You’ll have the opportunity to influence network and infrastructure architecture, improve resilience and performance, lead complex technical initiatives and shape how the organisation operates its network and Nutanix platforms.
If you're an experienced network/infrastructure engineer who wants to remain hands-on while operating at a senior technical level, we'd be keen to hear from you.
Apply now to find out more about the role and the wider technology environment.