Network Security Lead

In this role you lead network security operations across enterprise and campus environments, ensuring BPSS compliance. You act as the L3 SME for critical incidents and complex troubleshooting, drive security platform management and hardening, and oversee network infrastructure upgrades. You collaborate with cross-functional teams to maintain security standards and governance, contributing to secure, reliable enterprise networks. The position is based in London with hybrid work.

• Lead and manage enterprise Network Security Operations across LAN WAN WLAN SDWAN Firewall VPN NAC and Cloud environments
• Provide L3 technical SME support and act as primary escalation point for critical incidents
• Administer and support Palo Alto FortiGate Cisco FTD and Meraki security platforms including policy management and VPNs
• Manage and troubleshoot Cisco Nexus Aruba Dell and HP routing and switching infrastructure
• Support and maintain Wireless Networks using Cisco Aruba and Meraki controllers and access points
• Implement and maintain NAC solutions including Cisco ISE 8021X authentication and MFA integrations
• Design configure and troubleshoot advanced networking technologies (BGP OSPF EIGRP VXLAN EVPN DMVPN HSRP GLBP VPC IPsec)
• Drive Incident Change Problem and Service Request Management processes with adherence to SLAs
• Assess security vulnerabilities, review advisories, implement remediation plans and ensure network security compliance
• Lead infrastructure upgrades, patching activities and lifecycle management of devices
• Develop operational documentation, SOPs and knowledge repositories
• Identify and implement automation opportunities using Python/PowerShell or other tools to improve efficiency
• Mentor and guide network and security engineers providing technical leadership and governance
• Ensure BPSS security requirements, access controls, audit standards and customer policies are met
• Participate in customer reviews, CAB meetings, governance forums and stakeholder communications
• Provide support in a 24x7 environment including on-call and major incident response

• Minimum 8 years of experience in network security and related fields
• Proven expertise in enterprise and campus networking, cloud networking, and SDN
• BPSS compliance experience in controlled environments
• Strong vendor knowledge across multiple security platforms and network gear
• Ability to lead incident, change, problem, and service request processes with SLAs
• Experience with network design, implementation, and troubleshooting of complex environments

• leadership and mentoring
• strong communication with stakeholders
• problem-solving under pressure
• Palo Alto, FortiGate, Cisco FTD, Meraki security platforms
• Cisco Nexus, Aruba, Dell, HP routing and switching
• Cisco ISE, 802.1X authentication, MFA integrations