Senior Core Infrastructure Engineer

Location: Harwood, Leeds / Hybrid

Job Title: Senior Core Infrastructure Engineer

Job Type: Full‑time

Assured Data Protection is a global leader in data backup and disaster recovery managed services, specializing in safeguarding against data loss and downtime in the event of a disaster, cyber, or ransomware attack. Our fully managed services include immutable backup, disaster recovery, and cyber resiliency to protect data on‑premises and in the cloud, with 24/7/365 expert support.

We offer a flexible, consumption‑based model to grow with your business, making data protection cost-effective and scalable. Our purpose‑built software provides industry‑leading monitoring and reporting capabilities to provide actionable insights into your data protection strategy. Our global data centers ensure data sovereignty, meeting your organization’s compliance requirements. A dedicated team is always available to recover your data and minimize disruption in the event of a disaster.

We are seeking a highly skilled Senior Infrastructure Engineer to join our Global Core Infrastructure team. This role is responsible for designing, implementing, and supporting secure, scalable, and highly available network environments across multiple regions. The ideal candidate will have strong hands‑on experience with Cisco networking (ideally Nexus), Fortigate firewalls, with knowledge of Netgate pf Sense a plus. Familiarity with networking configuration of Enterprise virtualization platforms, such as VMware/Hyper‑V and Nutanix is preferred, and the candidate would be comfortable collaborating remotely with distributed teams across time zones.

The candidate will also be required to participate in the departments on‑call out‑of‑hours rota.

The role is not normally customer facing, however the ability to pick up issues and work with customer technical teams through to completion is important.

• Design, implement, and maintain enterprise‑grade network infrastructure across global environments
• Support and optimize Cisco‑based networks, including routing, switching, and data center technologies.
• Configure and manage Fortigate firewalls, including VPNs, security policies, and traffic inspection
• Troubleshoot complex network issues across LAN, WAN, and data center environments
• Collaborate with other infrastructure teams (client networking and virtualization) to support infrastructure projects and support issues.
• Participate in out‑of‑hours on‑call rota, providing operational support and incident response outside of standard business hours
• Provide networking expertise for virtualization platforms, including: VMware vSphere/ESXi/Microsoft Hyper‑V/Nutanix
• Participate in network architecture reviews, capacity planning, and performance tuning
• Create and maintain technical documentation, network diagrams, and operational procedures
  
  Support change management, incident response, and root cause analysis
• Work effectively as part of a global, remote team, including occasional out‑of‑hours support if required.

• CCNA certification or higher.
• Strong hands‑on experience with Cisco networking technologies
• Routing & Switching (BGP, VLANs, STP, LACP etc)
• Data center networking (Cisco Nexus highly desirable)
• Proven storage experience administering Enterprise storage arrays, the ideal candidate will have experience with Net App and NCDA certification.
• Proven experience managing Fortigate firewalls in enterprise environments
• Strong troubleshooting skills across complex, multi‑site networks
• Solid understanding of network security principles and best practices
• Experience working in a distributed or global IT team

• Experience with Netgate pf Sense firewalls
• Advanced data center networking experience
• Familiarity with SD‑WAN technologies
• Exposure to cloud networking (AWS, Azure, or GCP)
• Scripting or automation experience (Python, Ansible, etc.)

• Networking within VMware vSphere/ESXi environments
• Networking concepts for Microsoft Hyper‑V
• Networking architecture and integration with Nutanix

• Self‑motivated and comfortable working…