Senior Network Security Engineer

Senior Network Security Engineer Role: Senior Network Security Engineer (L4) Experience: 7+ years Location: Guildford, UK Work mode: Onsite Key Responsibilities Security Infrastructure Operations maintain device firmware/software to secure and supported versions; document operational procedures and provide knowledge transfer to L1/L2 teams. Technical Skills Cisco ISE (expert level) – authentication policies, authorization profiles, profiling, certificates, device onboarding. Cisco ASA/FTD – VPN, NAT, ACL, clustering, routing, packet tracer, Firepower Management Center (FMC). Check Point R80.x – SmartConsole, VPN, IPS, rule optimisation, HA/cluster. F5 APM – access policy creation, VPN configuration, SAML/OAuth integration. Cisco Switching/Routing in DC environment – Nexus (5k/7k/9k), VLANs, VPC, OSPF/BGP basics. Packet capture tools: Wireshark, tcpdump. Cloud networking (AWS/Azure) is a plus. Automation/Scripting knowledge (Python, Ansible) preferred but not mandatory. Experience 6–10+ years of strong experience in enterprise Network Security. Experience working in large, distributed, high‑availability environments. Proven track record of leading install, upgrade, migration, and decommission projects. Experience in handling major incidents and RCA documentation. Soft Skills Excellent communication and documentation skills. Strong analytical and troubleshooting capability. Ability to lead changes independently and collaborate with global teams. Ability to mentor junior engineers. #J-18808-Ljbffr