1,498 Network Security jobs in the United Kingdom

Team purpose

We are here to change lives through better sight and hearing by delivering outstanding value, being loved by every customer and creating the place where all colleagues are proud to belong as we grow our business.

The Network Platform team will own and develop (with the Enterprise Architecture team) the strategic network roadmap. Delivering changes, product development and maintenance required to achieve the objectives of the roadmaps. The team will also provide support and technical expertise in the case of a major incident. They work closely with third-party partners to deliver a safe, resilient, robust Network Platform and continuously review the industry and market, testing new concepts and technologies that can add value.

Your purpose

The Network Security Engineer supports the Lead Network Security Engineer in delivering the Network Security Roadmap. This role supports the implementation of Infosec-driven initiatives and acts as the second line of escalation for Network Security Incidents and ad hoc service and portfolio support requests. This role is accountable for establishing and maintaining secure network configurations, including firewalls, routers, switches, and VPNs, and periodically reviewing firewall rules and user access to the network. The Network Security Engineer focuses on continuous improvement through automation and tooling, working with Security Operations to monitor and analyse network traffic for malicious activity or potential breaches. Additionally, this role implements network access controls, enforces robust patch management for network devices, and works with network security partners to identify network vulnerabilities, planning and implementing upgrades to ensure the highest standards of network security.

This role is required to participate in an on-call rota for out-of-hours escalations for the Global Network Team.

Your role

• Support Network Security Roadmap: Assist in delivering the Network Security Roadmap.

• Subject Matter Expertise: Provide network subject matter expertise on Infosec-driven initiatives.

• Incident Escalation: Second line of escalation for network security incidents, as well as specific security Service and Portfolio Requests i.e. Meraki configuration and firewall changes.

• On Call Rota: Participate in on-call rota and occasionally work out of regular business hours to facilitate change management and incident resolution.

• Secure Network Configurations: Establish and maintain secure network configurations including Cisco Meraki and Palo Alto firewalls, routers, switches, and VPNs.

• Firewall and Access Review: Periodically review firewall rules and user access to the network.

• Continuous Improvement: Focus on continuous improvement through automation and tooling.

• Monitoring and Analysis: Collaborate with Security Operations to monitor and analyse network traffic for malicious activity or potential breaches.

• Access Controls: Implement network access controls to ensure only authorised users and devices can access specific network segments.

• Vulnerability and Patch Management: Identify and manage the remediation of network vulnerabilities and upgrades to ensure the highest standards of network security. This includes vulnerability management of the store Meraki estate. Perform robust patch management for network devices.

• IT Values Commitment: Champion and commit to performing the role within recognised Values & Behaviours.

What you'll bring

• Advanced Expertise in network solutions including MPLS, Internet, Cloud services, Firewalls, Routers, switches, Palo Alto, Meraki, and Cisco services.

• Bachelor's degree in relevant field and/or industry recognised certifications i.e. Cisco Certified Network Associate (CCNA).

• Proficiency in establishing secure network configurations, including firewalls, routers, switches, and VPNs.

• Experience with network access controls, vulnerability and patch management.

• Experience in implementing network-security solutions.

• Excellent verbal and written communication skills to articulate technical concepts to both technical and non-technical stakeholders.

• Expertise in monitoring and analysing network performance and incidents.

• Previous experience participating in on-call rotations and managing out-of-hours incidents effectively.

• Strong analytical skills to assess complex technical problems and develop effective solutions.

• Expertise in troubleshooting and resolving network security-related issues.

• Ability to work closely with cross-functional teams, including architecture, infosec and regional implementation teams.

• Dedication to performing the role within recognised values and behaviours.

Summer-Browning Associates is currently supporting our public sector client, who is seeking a Network Security Engineer for an initial twelve-month assignment with the option to extend.

Location: Hybrid working - Kidlington or Southampton

About the role: You will be responsible for day-to-day operation and control of all aspects of the client's sites and local area communications network infrastructure including Voice.

The ideal candidate will hold Active SC and have a strong background in delivery Network & Security support, with the following skills and experience:

• Experience with Checkpoint, Fortinet, Cisco & Solarwinds.
• Knowledge of IT and Voice Networks.
• Holds a recognised IT Networking qualification, or equivalent experience.
• Knowledge of Networking protocols & standards.

Network Security Engineer - Global Tech Operations
Location: Basingstoke (Hybrid - 3 days per week on-site)
Salary: 50,000-55,000 + excellent benefits

Join a business undergoing transformation, where you'll have the opportunity to shape how security and networking are delivered across a global, high-integrity environment. This is a great opportunity for an experienced Network Engineer with a strong troubleshooting mindset and a growing interest in cybersecurity tools and processes.

This isn't a rinse-and-repeat support desk role. You'll work on critical infrastructure, be trusted with important decisions, and have the chance to grow in both technical breadth and depth. With a new leadership team in place and investment in tooling underway, it's a great time to join.

What you'll be doing

You'll be supporting and improving complex networks and core infrastructure systems across a secure production environment. Day to day, you'll be configuring switches and firewalls, monitoring performance, investigating issues at network and transport layers, and helping maintain and evolve the organisation's security stack-including Defender XDR, SentinelOne, and iBoss. You'll work closely with infrastructure and security colleagues to help cross-train and provide joined-up support.

What you'll bring

• Strong hands-on experience with switching, firewalls, VPNs and WAN/LAN/WLAN support
• Knowledge of routing protocols (e.g., OSPF, BGP, RIP) and QoS techniques
• Experience with Cisco or HP networking tech (CLI preferred), plus Check Point or similar firewalls
• Familiarity with tools such as Microsoft Defender XDR, Sentinel, iBoss, Cisco ISE or Secure Access
• Awareness of vulnerability management, threat prevention, and SOC tooling
• Ability to investigate and troubleshoot under pressure with a methodical, root-cause approach
• Previous experience in an ITIL-aligned environment

Why this role?

• Be part of a newly integrated team where you'll gain exposure to both networking and security
• Work with a fantastic line manager and a team that values mutual learning
• Enjoy a varied, hands-on role with real autonomy-where your ideas for improvement will be heard
• Help support a transformation as the business invests in tooling, process and capability

You'll get 26 days' holiday, private health insurance, life cover, pension, flexible working (3 days onsite), and the opportunity to work in a collaborative, no-blame culture with global reach.

Due to the nature of the organisation, you will need to pass a security vetting process.

Network Security Engineer

Location: Basingstoke (Hybrid - 2-3 days on-site per week)

Salary: Up to 60,000 + 10% bonus

83zero are proud to be working with a leading global organisation, headquartered in Basingstoke, who are on the lookout for a Network Security Engineer to join their Central IT division. This business operates within a secure and highly regulated environment and are looking for a technically skilled professional to help maintain and enhance their critical network infrastructure.

As a Network Security Engineer , you'll play a vital role in the build, support, and evolution of complex networking systems, ensuring resilience, security, and performance across their production, pre-production, and development environments. You'll work closely with the Infrastructure and Security teams to both proactively manage the network and support ongoing security initiatives.

Key Responsibilities:

• Provide technical support and network configuration across LAN, WAN, WLAN, VPN, firewalls, and intrusion prevention systems
• Maintain and support Cisco, HP, and Check Point hardware/software
• Respond to service requests and incidents in line with ITIL processes
• Monitor and enhance network security controls including web security gateways, NAC, endpoint security, and perimeter defense
• Contribute to internal reviews, security audits, vulnerability assessments, and penetration testing
• Support firewall rule changes, VPN access, network segmentation, and performance improvements
• Participate in on-call rotation for high-priority issues and assist during major incidents
• Create and maintain documentation including SOPs and security protocols
• Support IT security team with threat modelling, remediation, and policy compliance

Essential:

• Strong background in network engineering and troubleshooting across complex environments
• Operational knowledge of LAN/WAN infrastructure, routing protocols (OSPF, BGP, EIGRP), VPN (IPSec, IKE, SSL), and firewall configuration
• Experience working in secure environments with a focus on proactive security posture
• Knowledge of network security tools such as Cisco Secure Access, Cisco ISE, Microsoft Defender XDR, Sentinel, and SentinelOne
• Comfortable with vulnerability management frameworks and tools
• Familiarity with network monitoring and performance management
• Previous experience working within an ITIL-based support framework
• Hands-on experience with Check Point, Cisco, or Palo Alto firewalls

Desirable:

• Certifications such as CCNA, CCNP, CISSP, or equivalent
• Experience with Citrix load balancing and Microsoft Azure networking
• Knowledge of WAF technologies
• ITIL Foundation certification

Team purpose

We are here to change lives through better sight and hearing by delivering outstanding value, being loved by every customer and creating the place where all colleagues are proud to belong as we grow our business.

The Network Platform team will own and develop (with the Enterprise Architecture team) the strategic network roadmap. Delivering changes, product development and maintenance required to achieve the objectives of the roadmaps. The team will also provide support and technical expertise in the case of a major incident. They work closely with third-party partners to deliver a safe, resilient, robust Network Platform and continuously review the industry and market, testing new concepts and technologies that can add value.

Your purpose

The Network Security Engineer supports the Lead Network Security Engineer in delivering the Network Security Roadmap. This role supports the implementation of Infosec-driven initiatives and acts as the second line of escalation for Network Security Incidents and ad hoc service and portfolio support requests. This role is accountable for establishing and maintaining secure network configurations, including firewalls, routers, switches, and VPNs, and periodically reviewing firewall rules and user access to the network. The Network Security Engineer focuses on continuous improvement through automation and tooling, working with Security Operations to monitor and analyse network traffic for malicious activity or potential breaches. Additionally, this role implements network access controls, enforces robust patch management for network devices, and works with network security partners to identify network vulnerabilities, planning and implementing upgrades to ensure the highest standards of network security.

This role is required to participate in an on-call rota for out-of-hours escalations for the Global Network Team.

Your role

• Support Network Security Roadmap: Assist in delivering the Network Security Roadmap.

• Subject Matter Expertise: Provide network subject matter expertise on Infosec-driven initiatives.

• Incident Escalation: Second line of escalation for network security incidents, as well as specific security Service and Portfolio Requests i.e. Meraki configuration and firewall changes.

• On Call Rota: Participate in on-call rota and occasionally work out of regular business hours to facilitate change management and incident resolution.

• Secure Network Configurations: Establish and maintain secure network configurations including Cisco Meraki and Palo Alto firewalls, routers, switches, and VPNs.

• Firewall and Access Review: Periodically review firewall rules and user access to the network.

• Continuous Improvement: Focus on continuous improvement through automation and tooling.

• Monitoring and Analysis: Collaborate with Security Operations to monitor and analyse network traffic for malicious activity or potential breaches.

• Access Controls: Implement network access controls to ensure only authorised users and devices can access specific network segments.

• Vulnerability and Patch Management: Identify and manage the remediation of network vulnerabilities and upgrades to ensure the highest standards of network security. This includes vulnerability management of the store Meraki estate. Perform robust patch management for network devices.

• IT Values Commitment: Champion and commit to performing the role within recognised Values & Behaviours.

What you'll bring

• Advanced Expertise in network solutions including MPLS, Internet, Cloud services, Firewalls, Routers, switches, Palo Alto, Meraki, and Cisco services.

• Bachelor's degree in relevant field and/or industry recognised certifications i.e. Cisco Certified Network Associate (CCNA).

• Proficiency in establishing secure network configurations, including firewalls, routers, switches, and VPNs.

• Experience with network access controls, vulnerability and patch management.

• Experience in implementing network-security solutions.

• Excellent verbal and written communication skills to articulate technical concepts to both technical and non-technical stakeholders.

• Expertise in monitoring and analysing network performance and incidents.

• Previous experience participating in on-call rotations and managing out-of-hours incidents effectively.

• Strong analytical skills to assess complex technical problems and develop effective solutions.

• Expertise in troubleshooting and resolving network security-related issues.

• Ability to work closely with cross-functional teams, including architecture, infosec and regional implementation teams.

• Dedication to performing the role within recognised values and behaviours.

Summer-Browning Associates is currently supporting our public sector client, who is seeking a Network Security Engineer for an initial twelve-month assignment with the option to extend.

Location: Hybrid working - Kidlington or Southampton

About the role: You will be responsible for day-to-day operation and control of all aspects of the client's sites and local area communications network infrastructure including Voice.

The ideal candidate will hold Active SC and have a strong background in delivery Network & Security support, with the following skills and experience:

• Experience with Checkpoint, Fortinet, Cisco & Solarwinds.
• Knowledge of IT and Voice Networks.
• Holds a recognised IT Networking qualification, or equivalent experience.
• Knowledge of Networking protocols & standards.

Network Security Engineer - Global Tech Operations
Location: Basingstoke (Hybrid - 3 days per week on-site)
Salary: 50,000-55,000 + excellent benefits

Join a business undergoing transformation, where you'll have the opportunity to shape how security and networking are delivered across a global, high-integrity environment. This is a great opportunity for an experienced Network Engineer with a strong troubleshooting mindset and a growing interest in cybersecurity tools and processes.

This isn't a rinse-and-repeat support desk role. You'll work on critical infrastructure, be trusted with important decisions, and have the chance to grow in both technical breadth and depth. With a new leadership team in place and investment in tooling underway, it's a great time to join.

What you'll be doing

You'll be supporting and improving complex networks and core infrastructure systems across a secure production environment. Day to day, you'll be configuring switches and firewalls, monitoring performance, investigating issues at network and transport layers, and helping maintain and evolve the organisation's security stack-including Defender XDR, SentinelOne, and iBoss. You'll work closely with infrastructure and security colleagues to help cross-train and provide joined-up support.

What you'll bring

• Strong hands-on experience with switching, firewalls, VPNs and WAN/LAN/WLAN support
• Knowledge of routing protocols (e.g., OSPF, BGP, RIP) and QoS techniques
• Experience with Cisco or HP networking tech (CLI preferred), plus Check Point or similar firewalls
• Familiarity with tools such as Microsoft Defender XDR, Sentinel, iBoss, Cisco ISE or Secure Access
• Awareness of vulnerability management, threat prevention, and SOC tooling
• Ability to investigate and troubleshoot under pressure with a methodical, root-cause approach
• Previous experience in an ITIL-aligned environment

Why this role?

• Be part of a newly integrated team where you'll gain exposure to both networking and security
• Work with a fantastic line manager and a team that values mutual learning
• Enjoy a varied, hands-on role with real autonomy-where your ideas for improvement will be heard
• Help support a transformation as the business invests in tooling, process and capability

You'll get 26 days' holiday, private health insurance, life cover, pension, flexible working (3 days onsite), and the opportunity to work in a collaborative, no-blame culture with global reach.

Due to the nature of the organisation, you will need to pass a security vetting process.

Network Security Engineer

Location: Basingstoke (Hybrid - 2-3 days on-site per week)

Salary: Up to 60,000 + 10% bonus

83zero are proud to be working with a leading global organisation, headquartered in Basingstoke, who are on the lookout for a Network Security Engineer to join their Central IT division. This business operates within a secure and highly regulated environment and are looking for a technically skilled professional to help maintain and enhance their critical network infrastructure.

As a Network Security Engineer , you'll play a vital role in the build, support, and evolution of complex networking systems, ensuring resilience, security, and performance across their production, pre-production, and development environments. You'll work closely with the Infrastructure and Security teams to both proactively manage the network and support ongoing security initiatives.

Key Responsibilities:

• Provide technical support and network configuration across LAN, WAN, WLAN, VPN, firewalls, and intrusion prevention systems
• Maintain and support Cisco, HP, and Check Point hardware/software
• Respond to service requests and incidents in line with ITIL processes
• Monitor and enhance network security controls including web security gateways, NAC, endpoint security, and perimeter defense
• Contribute to internal reviews, security audits, vulnerability assessments, and penetration testing
• Support firewall rule changes, VPN access, network segmentation, and performance improvements
• Participate in on-call rotation for high-priority issues and assist during major incidents
• Create and maintain documentation including SOPs and security protocols
• Support IT security team with threat modelling, remediation, and policy compliance

Essential:

• Strong background in network engineering and troubleshooting across complex environments
• Operational knowledge of LAN/WAN infrastructure, routing protocols (OSPF, BGP, EIGRP), VPN (IPSec, IKE, SSL), and firewall configuration
• Experience working in secure environments with a focus on proactive security posture
• Knowledge of network security tools such as Cisco Secure Access, Cisco ISE, Microsoft Defender XDR, Sentinel, and SentinelOne
• Comfortable with vulnerability management frameworks and tools
• Familiarity with network monitoring and performance management
• Previous experience working within an ITIL-based support framework
• Hands-on experience with Check Point, Cisco, or Palo Alto firewalls

Desirable:

• Certifications such as CCNA, CCNP, CISSP, or equivalent
• Experience with Citrix load balancing and Microsoft Azure networking
• Knowledge of WAF technologies
• ITIL Foundation certification