Senior Core Infrastructure Engineer

Company: The SJB Group
Apply for the Senior Core Infrastructure Engineer
Location: Leeds
Job Description:

We’re looking for a Senior Infrastructure Engineer to join a global team delivering secure, scalable, and highly available network environments across multiple regions.

This is a hands‑on role suited to someone with strong Cisco networking experience (ideally Nexus) and expertise in Fortigate firewalls, who thrives in complex, enterprise environments.

What you’ll be doing:

  • Designing and supporting global network infrastructure (LAN/WAN/Data Centre)
  • Managing Cisco routing & switching (BGP, VLANs, STP, LACP)
  • Configuring Fortigate firewalls, VPNs & security policies
  • Troubleshooting complex, multi‑site network issues
  • Supporting virtualised environments (VMware, Hyper‑V, Nutanix)
  • Contributing to architecture, performance tuning & incident response
  • Collaborating with global teams (with on‑call rota participation)

What we’re looking for:

  • Strong Cisco networking background (Nexus highly desirable)
  • Fortigate firewall experience in enterprise environments
  • Solid understanding of network security & best practices
  • Experience working in global/distributed teams

Nice to have:

  • pfSense, SD‑WAN, or cloud networking (AWS/Azure/GCP)
  • Scripting/automation (Python, Ansible)
  • Fully remote role
  • Work on enterprise‑scale infrastructure
  • Be part of a global, collaborative tech team

#J-18808-Ljbffr…

Posted: March 29th, 2026