Job Req ID: 62430Posting Date: 16/09/2026Function: Security & Network EngineeringLocation: DerbyAbout the roleThe 3rd Line Security Specialist will provide lead technical support and great customer experience on complex security issues and projects – being connected and clear with customer representatives or vendors and directing other support staff where appropriate, during an exciting time within the business.Working into Bespoke Operations, onsite in an air gapped secure customer facility alongside other BT personnel and 3rd party engineers, you will be committed to reducing KPIs and SLAs to below customer expectations, ensuring that the customer and it’s service comes first.The successful candidate will need to be eligible to gain and hold Government Security Clearance to SC UK Eyes Only Level. You may also be required to go through Government Security Clearance to DV Level in the future.What you’ll be doing• Be a Subject Matter Expert for a wide range of technologies & security products.• Detect, respond and resolve complex security incidents,



problems and changes within the operational environment.• Provide 3rd line support, responsible for the high priority incident while resolving within the agreed SLA.• Be the technology SME for specialised products and services.• Be the operational SPOC for our design or customer contract teams.• Providing RCA’s and contributing to PIR’s as and when required.Essential Skills / Experience• Proven operational experience across Network Engineering and Security Operations Specialist roles, with strong stakeholder management skills and the ability to work directly onsite with customers to support complex network solutions.• Proven experience across Cisco Firewalls, Checkpoint Firewalls/IPS, F5 Load Balancing, Cisco WSA / ESA / ISE, Ivanti Pulse VPN, Switches and Routers, supported by industry recognised certifications or relevant experience.• Ability to lead and manage major or complex security & network incidents, coordinating

📌 3rd Line Security Specialist (España)
🏢 Bt Group
📍 España