Job Description

Job Req ID: 62430

Posting Date: 02/09/2026

Function: Security & Network Engineering

Location: Derby

About the role

The 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 teleconferences and liaising with designers and wider teams to troubleshoot, fault-find and drive resolution.

Desirable Skills / Experience

• Exposure to ServiceNow reporting and dashboarding.
• Experience of Fortinet Firewalls and NetScout.
• Excellent experience of managing multiple incidents as a lead, making the right decision to resolve within agreed SLAs.

Our Package

Tailored benefits make a real difference. That’s why we offer a comprehensive range to support your growth, wellbeing, and everyday life. You can design the package to suit you and your lifestyle. Your core benefits include:

• 10% on target annual bonus
• Access to an online private GP 24/7 for you and your immediate family
• Market-leading paid carers leave with up to 2 weeks off
• Equalised maternity, paternity, and adoption leave – 18 weeks’ full pay and 8 weeks’ half pay
• Discounted EE and BT products, including mobile and broadband
• Market leading Pension scheme – 5% from you and 10% from us
• Holiday purchase scheme
• You can select additional benefits, including healthcare, dental, gym memberships and more when you’re ready

Working Pattern

• Fully on-site role with no home working.
• You will form an integral part of our 24x7 team providing security in-life technical support, that will including shift working – 2 days 2 nights 4 off – 7-7.

Join us at a pivotal moment for BT Business. We are executing a multi-year transformation to restore growth, modernise at scale and unlock new markets beyond connectivity. Our ambition is clear – return to sustainable revenue and EBITDA growth, strengthen our market position, and deliver meaningful shareholder value through disciplined execution and bold reinvention.

We are fundamentally reshaping the business – simplifying our portfolio, digitising our customer experience and building market-leading capability across cyber, AI and managed services, all powered by the UK’s leading fixed and mobile networks. This is a shift from a legacy connectivity provider to a modern, solutions-led, AI-first business that can truly differentiate in a competitive and fast-moving market.

With execution momentum building and a clear path to growth, the opportunity now is to scale what works, accelerate performance and fully realise our potential. This is about delivering against ambitious financial outcomes while transforming how we operate – creating a business that is simpler, faster, more innovative and easier to do business with.

If you want to be part of the team shaping the turnaround of a multi-billion-pound business – and building a stronger, more competitive BT for the future – this is your moment.