Senior Network Security Engineer
4 hours ago
LocationBloomsbury Square, London, United Kingdom# Senior Network Security Engineer at N Consulting LtdLocationBloomsbury Square, London, United KingdomSalary£65 - £69 /yearJob TypeFull-timeDate PostedDecember 9th, 2025Apply Now**Role:** Senior Network Security Engineer (L4)**Experience:** 10years**Location:** Guildford,UK**Work mode:** Onsite**Key Responsibilities**1. Security Infrastructure Operations & EngineeringManage, configure, and troubleshoot Cisco ISE (TACACS+, RADIUS, Dot1X, CoA, Profiling). Administer and support Cisco ASA/FTD firewalls including ACLs, NAT, VPN, failover, clustering, and upgrades. Manage Check Point firewalls (R80.x) — policy management, clustering, VPN, logging, and health checks. Handle F5 APM for remote access VPN, SSO, authentication policies, and application access. Support data center network security architecture (firewalls, segmentation, VRF, routing, switching security).2. Implementation, Installations & DecommissioningPerform installation, configuration, and deployment of security devices (ASA/FTD, Check Point, ISE nodes, F5 APM). Lead hardware refresh, firewall replacement, and migration projects. Execute device decommissioning, ensuring proper cleanup of configs, rule removal, rack removal, and documentation. Conduct cutover activities, change execution, and post-implementation validation.3. Project & Architecture SupportParticipate in designing secure network architectures for enterprise and data center environments. Work with cross-functional teams to review network and security requirements. Create and maintain HLDs/LLDs, network diagrams, migration plans, and SOPs.4. Security Operations & TroubleshootingAct as L4 SME for escalations related to network security issues. Troubleshoot identity/authentication failures, VPN issues, firewall packet drops, routing conflicts. Perform root-cause analysis (RCA), remediation plans, and long-term fixes. Monitor system health, logs, and alerts across multiple platforms.5. Governance, Compliance & Best PracticesEnsure compliance with security standards (ISO 27001, NIST, PCI-DSS, CIS benchmarks). Conduct periodic rule/policy optimization, cleanup, and audits. Maintain device firmware/software to secure and supported versions. Document operational procedures and provide knowledge transfer to L1/L2 teams.**Required Skills & Experience****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 optimization, 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.
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Senior Network Security Engineer
10 hours ago
Guildford, United Kingdom N Consulting Limited Full timeLocationBloomsbury Square, London, United Kingdom# Senior Network Security Engineer (L4) at N Consulting LtdLocationBloomsbury Square, London, United KingdomSalary£65 - £69 /yearJob TypeFull-timeDate PostedDecember 9th, 2025Apply Now**Role:** Senior Network Security Engineer (L4)**Experience:** 10years**Location:** Guildford,UK**Work mode:** Onsite**Role...
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Network Security Engineer
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Guildford, United Kingdom Adroit People Ltd Full timeGreetings!AdroitPeopleiscurrentlyhiringTitle: Network Security EngineerFind out more about the daily tasks, overall responsibilities, and required experience for this opportunity by scrolling down now. Location:Guildford Business Park Guildford Surrey GU2 8XG OR Bournemouth, UKWorkMode:Onsite Duration: Contract or 6 Months FTC Keywords:Cisco,Network Security...
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Network Security Engineer
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Guildford, United Kingdom Adroit People Ltd Full timeGreetings!AdroitPeopleiscurrentlyhiringTitle: Network Security EngineerFind out more about the daily tasks, overall responsibilities, and required experience for this opportunity by scrolling down now. Location:Guildford Business Park Guildford Surrey GU2 8XG OR Bournemouth, UKWorkMode:Onsite Duration: Contract or 6 Months FTC Keywords:Cisco,Network Security...
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Network Security Engineer
12 hours ago
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Senior Network Security Engineer – Firewall
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Guildford, United Kingdom N Consulting Limited Full timeA specialized consulting firm is seeking a Senior Network Security Engineer to manage and secure network infrastructure in Guildford, UK. Candidates should possess 6+ years of experience with Cisco ISE, ASA, Check Point firewalls, and a strong background in security operations. Responsibilities include installation and troubleshooting of network security...
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Senior Network Security Engineer
2 days ago
Guildford, Surrey, United Kingdom Codeconvergence Limited (CCL) Full time £80,000 - £120,000 per yearRole OverviewWe are seeking a highly skilled L4 Network Security Engineer with deep expertise in Cisco security technologies, Check Point firewalls, and F5 APM. The ideal candidate will be responsible for designing, implementing, optimizing, and troubleshooting enterprise security solutions across multi-site and data center environments.This role requires...
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Guildford, United Kingdom N Consulting Limited Full timeA leading consulting firm is seeking a Senior Network Security Engineer (L4) based in Guildford, UK. The candidate should have 6-10 years of expertise in Cisco security technologies, including ISE and ASA/FTD. Responsibilities include managing security infrastructure, implementing solutions, and troubleshooting network issues. Ideal candidates are strong...
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Guildford, United Kingdom Falcon Smart IT (FalconSmartIT) Full timeA technology services company is looking for a skilled Network Security Engineer (Cisco ISE Expert) in Guildford or Bournemouth, UK. The role involves designing and troubleshooting security solutions in enterprise environments, requiring expertise in Cisco technologies and Check Point firewalls. Ideal candidates should have 6–10+ years in enterprise...
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Network Security Engineer
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Guildford, United Kingdom Falcon Smart IT (FalconSmartIT) Full timeNetwork Security Engineer (Cisco ISE Expert) Location: Guildford, UK or Bournemouth, UK Job Type: Contract Inside IR35 / Fixed Term Contract We are seeking a highly skilled L4 Network Security Engineer with deep expertise in Cisco security technologies, Check Point firewalls, and F5 APM. The ideal candidate will be responsible for designing, implementing,...
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Senior Network
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Guildford, Surrey, United Kingdom Hawksworth Full timePosition: Senior Network & Security Specialist Salary: 80k GBP base Industry: Global Insurer Hybrid: 1 day per week in the office Location: Guildford, Surrey If you're a seasoned IT Infrastructure Engineer with extensive Network Security experience, this role is for you. Our client are one of the largest financial services companies in the world, so having...
