Senior Network Security Engineer

BT plc; Manchester; On-site; GBP 75,000 - 105,000; Full time

Benefits offered by this job

10% bonus on target annual

Private GP 24/7 for you and family

Care leave – up to 2 weeks

Pension scheme – company matching

Holiday purchase scheme

Healthcare options

Job summary

BT plc in Manchester is seeking a Senior Network Security Engineer to provide 3rd-line expertise and act as a key escalation point for complex network security issues.

You will lead the technical resolution of major incidents, guide high‑risk changes and mentor engineers while contributing to automation and resilience improvements across multi‑customer and multi‑vendor environments.

Qualifications

• 3rd-line network security experience in large-scale or 24/7 environments.
• Experience leading P1/P2 incidents and high‑risk changes.
• Mentoring engineers and driving automation initiatives.

Responsibilities

• Provide 3rd-line technical leadership and SME expertise across Network Security Operations.
• Lead technical resolution of P1/P2 security incidents to service restoration.
• Provide specialist troubleshooting for complex incidents beyond 2nd-line support.
• Assure complex, high-risk network security changes with risk management.
• Develop technical documentation, service maps and artefacts for complex services.

Skills

3rd-line security

Incident leadership

Automation / Scripting

Tools

Palo Alto

F5 BIG-IP

Netskope

Forescout NAC

Job description

Job Description

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Job Title: Senior Network Security Engineer

Req ID: 63674

Job Function: Cyber Security

Posting Start Date: 11/11/2026

Posting End Date: 29/11/2026

Division: UK Business

Job Location: GBR-Manchester-New Bailey

Advertised Salary: Competitive + Benefits

Job Req ID: 63674

Function: Security

Positions: 7

Shift work: 24/7 shift (c£11k shift allowance on top of base.) and day shift patterns available.

Base location: Manchester - lives within a commutable distance i.e Leeds, Sheffield, Liverpool, Derby

SECURITY CLEARANCE: This role requires Security Check (SC) clearance. Due to the security requirements of the role, applicants must be sole UK nationals and have been continuously resident in the UK for a minimum of five years.

About the role

Our network security team is growing, we have 7 positions available to support one our major security defence partnerships.

As our Senior Network Security Engineers, you’ll be senior technical experts within our Secure Networks team, helping protect and support critical customer network environments.

Operating from a 3rd-line subject matter expert perspective, you’ll provide deep technical expertise across complex network security services and act as a key escalation point when incidents, changes or technical challenges require specialist knowledge.

You’ll lead the technical response to complex and critical incidents, provide oversight of higher-risk changes and help guide technical decision-making across multi-customer and multi-vendor environments.

Beyond resolving immediate issues, you’ll use your expertise to strengthen service resilience, develop technical capability across the team and identify opportunities for automation and continuous improvement.

You’ll be a trusted technical advisor to engineers, customers and stakeholders, bringing the judgement, technical depth and problem-solving skills needed to tackle some of our most challenging network security problems.

Security requirement: This role supports a major UK defence security partnership. You must therefore be eligible to obtain the required UK Security Clearance and be a sole UK national passport holder, having sole residency in the UK for a minimum of 5 years.

What you’ll be doing

• Providing 3rd-line technical leadership and SME expertise across Network Security Operations, acting as a key escalation point for complex technical issues.
• Leading the technical resolution of complex and critical P1/P2 security incidents, providing clear technical direction through to service restoration.
• Providing specialist troubleshooting where incidents cannot be resolved through standard operational or 2nd-line support.
• Leading or providing technical assurance for complex and higher-risk network security changes, ensuring they are appropriately assessed, peer-reviewed and risk-managed.
• Providing deep technical expertise including firewalls, VPNs, secure connectivity and associated network security technologies (Palo Alto, F5 Load Balancers and Web Application Firewall, Forescout NAC, Netskope).
• Analysing recurring and systemic technical issues and developing longer-term solutions that improve resilience and reduce repeat incidents.
• Acting as a senior technical advisor to customers, colleagues and stakeholders, providing specialist recommendations and influencing technical decisions.
• Mentoring engineers and sharing specialist knowledge to develop technical capability across the wider team.
• Identifying opportunities to use automation, scripting and tooling to improve operational efficiency, consistency and scalability.
• Creating and maintaining high-quality technical documentation, service maps and implementation artefacts for complex services and changes.
• Contributing specialist expertise to technical discussions, workshops and service or solution design.
• Collaborating across Product, Engineering and Operations teams to resolve complex problems and improve customer outcomes.
• Maintaining rigorous standards across information security, data protection, risk and change governance.

Essential Skills / Experience

• 3rd-line network security expertise Significant hands‑on experience operating as a 3rd-line Network Security Engineer, escalation point or SME across a large scale or 24/7 Network or Security Operations environments, with strong technical knowledge of firewalls, VPNs, secure connectivity and associated network security technologies (Palo Alto, F5 Load Balancers and Web Application Firewall, Forescout NAC, Netskope).
• Complex incident and change leadership Proven experience leading the technical resolution of complex or critical P1/P2 incidents and providing technical leadership or assurance for complex, higher-risk network security changes within live operational environments.
• Technical leadership and continuous improvement Experience using deep technical expertise to solve recurring problems, improve service resilience and develop technical capability, including mentoring engineers and contributing to automation, technical design or operational improvements.

Desirable Skills / Experience

• Complex, multi-customer or multi-vendor security environments
• Industry‑recognised security or networking certifications, such as Palo Alto PCNSE, or equivalent practical experience
• Automation or scripting within network or security operations
• Technical or service design and producing high-quality technical documentation
• ITIL incident, problem and change‑management practices

Our Package

• Competitive salary
• 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
• Equalized 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.

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.