BT Group
Network Security Specialist
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Job Title: Network Security Specialist
Req ID: 62262
Job Function: Cyber Security
Posting Start Date: 04/09/2026
Posting End Date: 15/09/2026
Division: UK Business
Job Location: GBR Sheffield Endeavour
Advertised Salary: Competitive + Benefits
About The Role
This role exists to provide specialist technical support on complex network security operations for our UK secure contracts. Utilising Network Security, Firewall and load balancing skillsets. Building intermate working relationships and trust through effective communication and meeting expectation and deadlines is key. Liaising with customer representatives or vendors and directing other support staff where appropriate will form part of the role.
What You’ll Be Doing
- Provide leadership on Agile / ITIL processes and be a decision maker within the security team; Advising those who will be working directly with yourself on best practices and able to support from a 3rd Line Lead perspective.
- Develop peers and colleagues within the team through mentoring and leadership providing trustworthy honest feedback.
- Produce and support polices, functions and configuration builds to allow implementation of customer projects.
Essential Skills / Experience
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- Minimum of CCNP +/ Equal Certification plus the below Firewall Engineering Skillset:
- Fortinet
- Cisco ASA, ISE & FirePower
- Palo Alto
- Checkpoint
- ZScaler
- F5 Load balancer
- Knowledge and understanding of TCP/IP & OSI seven-layer model and how data networks are structured and operate.
- Knowledge of the best engineering practices and continuous delivery
- Always Maintain appropriate levels of clearance (MPS, NPPV3 & SC clearances at time of writing)
- Design user journeys, service maps, documentation, user flows and wireframes
- Collaborate with Product and Engineering colleagues. Facilitate workshops and design sprints.
- Skilled in building strong relationships across multiple teams
Our Package
- Competitive salary and on-target bonus plan
- Flexible and smart working
- Training and development opportunities
- Competitive share options and pension scheme
- Access to discounts on BT & EE products
- 25 days annual leave (not including bank holidays)
- 3 days paid volunteering a year
- Weekly Hours: 37.5
- Salary: Level D
- Position Type: Full-time
- Contract: Permanent
Join us
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.
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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.
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