Network Security Specialist

BT Group; Sheffield; Hybrid; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Competitive salary

Flexible and smart working

Training and development opportunities

Share options and pension

Discounts on BT & EE products

25 days annual leave

3 days volunteering a year

37.5 hour week

Permanent contract

Job summary

BT Group in Sheffield is seeking a Network Security Specialist to provide specialist technical support on complex network security operations for UK secure contracts, using firewall and load balancing skillsets. You will build trusted relationships with customers and vendors while guiding a security team to meet deadlines.

Role requires CCNP or equal certification plus extensive firewall engineering knowledge across Fortinet, Cisco ASA/ISE/FirePower, Palo Alto, Checkpoint, ZScaler and F5.

Qualifications

• CCNP or equal certification required.
• Firewall engineering experience and design/implementation knowledge.
• Security clearance levels (MPS, NPPV3 & SC) may apply.

Responsibilities

• Lead security engineering and drive best practices across teams.
• Develop policies, functions and configurations for customer projects.
• Collaborate with Product and Engineering; run workshops and design sprints.
• Mentor peers and promote continuous delivery and agile processes.

Skills

Agile leadership

ITIL

Team mentoring

Vendor liaison

Tools

Fortinet

Cisco ASA

Cisco ISE

FirePower

Palo Alto

Checkpoint

ZScaler

F5 Load Balancer

Job description

Job Description

Job Title: Network Security Specialist

Job Function: Cyber Security

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

• One key thing that all of our engineers have in common is a desire to develop/deliver brilliant, industry redefining platforms as well as their own skills.
• 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

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 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.