Senior 3rd Line Network Engineer - Flexible, High-Impact IT

LEIDOS INNOVATIONS UK LTD is seeking a Senior 3rd Line Network Engineer to join our Core Services team in the UK. You will diagnose complex faults, perform problem management, and contribute to CSI and Change Work on IT systems supporting critical national security outputs.

Role requires advanced Cisco LAN expertise, SDN experience with VMware NSX, and strong WAN/routing skills. Expect proactive and reactive maintenance, stakeholder liaison, and KPI-driven delivery.