Top Network Engineer Jobs in London

Design, implement, operate, and troubleshoot CrowdStrike’s global multi-vendor, multi-cloud, hybrid data center networks. Build cloud connectivity and network constructs, develop infrastructure-as-code and automation using Ansible, Terraform, Python, and Go, improve resilience and deployment efficiency, support incident analysis and on-call rotations, and ensure compliance with regional data sovereignty and security requirements.

Designs, deploys, automates, and operates high-performance data center network fabrics for multi-tenant AI and GPU clusters. Responsibilities include RDMA networking, leaf-spine architecture, BGP and EVPN/VXLAN, tenant isolation, telemetry, troubleshooting, out-of-band recovery, capacity planning, and office networking. The role also documents designs, supports onboarding, and teaches colleagues networking practices.

Provide second-line technical support for complex network and platform incidents. Diagnose logs, audit rules, perform upgrades and patches, manage configuration changes, and collaborate with third-line teams and vendors. Support Cisco, firewall, load-balancing, cloud, and networking technologies; document incidents, implement approved changes, assist transitions, maintain certifications, and provide remote support during rotating 12-hour night shifts.

Designs, deploys, troubleshoots, and optimizes enterprise routing, switching, wireless, and network automation solutions for global client locations. Responsibilities include configuring advanced L2/L3 technologies, conducting Wi-Fi surveys and RF optimization, developing Python and API-based automation, collaborating with global teams and stakeholders, documenting network environments, and supporting knowledge transfer. The role requires extensive international and domestic travel, strong client-facing communication, and expertise in large-scale enterprise networks.

Leads the design, implementation, optimization, and support of secure enterprise networks across on-premises, hybrid, and multi-cloud environments. Responsibilities include network architecture, segmentation, Cisco and Palo Alto administration, Tier 3 incident escalation, upgrades, migrations, automation, NetDevOps, documentation, vendor management, governance, and technical guidance. The role requires collaboration across global infrastructure, cloud, security, and service management teams, with travel within EMEA a few times per month.

Designs, commissions, configures, patches, and maintains IT infrastructure and networks, including servers, switches, firewalls, routers, and operating systems. Develops operational and security procedures, conducts testing, manages risks, supports stakeholders and suppliers, and trains maintenance teams. The role requires experience with virtualization, containerization, databases, Windows, Linux, and network security standards. It is hybrid in London or Cheltenham and requires existing UK SC clearance or eligibility to obtain it.

Own and improve corporate networks, infrastructure, workplace technology, and office systems. Provide advanced IT support, troubleshoot networks and endpoints, administer Cisco LAN/WAN environments and FortiGate firewalls, manage office hardware, improve device and access management, and collaborate on network security. Build monitoring, alerting, and documentation to maintain reliable business-critical systems across offices.

Establishes, maintains, and troubleshoots connections between Clir’s platform, client networks, and data sources. Develops system improvements, supports AWS network infrastructure, communicates with client IT teams, and maintains connection documentation. The role requires cloud computing, networking protocols, VPN, database, and file-transfer knowledge, along with strong problem-solving and communication skills. Renewable energy, infrastructure-as-code, containerization, industrial protocols, and pfSense experience are beneficial.

Design and develop core components of a distributed storage platform in Rust. Build scalable, resilient services for large data workloads, optimize systems running in Kubernetes, integrate Kafka-based event streaming, and contribute to distributed-systems architecture. Collaborate with researchers and engineers to understand data-access requirements while promoting testing, code quality, operational excellence, and clear technical communication.

Designs, deploys, and supports global data-center and enterprise networks across financial sites. Delivers network projects, third-party service turn-ups, migrations, and platform refreshes. Leads routing, switching, EVPN/VXLAN, incident escalation, root-cause analysis, automation, monitoring, infrastructure upgrades, and network audits. Requires expertise across Juniper, Arista, and Cisco platforms, plus Python and Ansible automation. The role also mentors junior engineers and coordinates technical handovers across global regions.

Maintain and troubleshoot edge network infrastructure for managed-service customers, including firewalls, routing, switching, wireless networks, and VoIP systems. Process firewall and routing changes, investigate connectivity and performance issues, support Cisco Firepower and Call Manager environments, perform break/fix replacements, and document processes. The role requires strong communication and problem-solving skills, with Cisco certification and CompTIA networking or security credentials advantageous.

Build scalable network automation applications across frontend and backend. Collaborate with network engineers and stakeholders to define requirements, implement modular UIs and services, maintain code quality, testing, CI/CD, documentation, and adopt best practices and tooling within Agile delivery.

Provides corporate IT support in London, specializing in network and security operations. Owns network incidents, vendor relationships, clinic-room technology readiness, site deployments, Microsoft 365 administration, endpoint management, documentation, and automation. Supports new clinic openings, improves operational processes, coordinates AV partners, and collaborates with global teams. Travel to US sites is required for onsite deployment activities.

Provides Level-1 triage and first-line support for network and security incidents, service requests, and connectivity issues. Responsibilities include ticket triage, SLA-based escalation, customer and ISP communication, change implementation support, technical documentation, and troubleshooting across routing, SD-WAN, firewalls, switching, and Internet services. The role requires flexible shift work, occasional travel to company sites, and a structured, customer-focused approach.

Eight-week remote internship providing hands-on network security training through traffic monitoring, intrusion detection, firewall and VPN configuration, operating system hardening, patch management, vulnerability assessment, penetration testing, wireless security testing, network segmentation, and cryptography. Interns use tools such as Wireshark, Nmap, pfSense, and Cisco Packet Tracer, complete practical challenges, and present a final assessment.

Lead day-to-day operation, availability, resilience, and security of the enterprise network platform. Manage incidents, problems, changes, escalations, root cause analysis, suppliers, governance, compliance, monitoring, automation, reporting, and KPI frameworks. Drive continuous improvement, operational excellence, reliability, and cost-effectiveness across cloud, data centre, WAN, LAN, wireless, and security environments while communicating effectively with technical and non-technical stakeholders.

Maintains, supports, enhances, and leads the lifecycle management of critical IP network infrastructure. Responsibilities include fault resolution, planned maintenance, network upgrades, project delivery, service transition, testing, documentation, supplier supervision, network design updates, continuous improvement, and technical mentoring. The role requires expertise in complex always-on networks, routing protocols, MPLS, multicast, Cisco platforms, QoS, data center technologies, security devices, AWS, and automation.

Designs, deploys, and supports high-performance, low-latency networks and data center connectivity. Automates network configuration and observability using Ansible and Terraform, supports broader infrastructure, manages vendors and circuit providers, and plans data center work. The role requires coding ability, network and systems administration experience, routing and switching knowledge, Linux proficiency, firewall automation, troubleshooting skills, and familiarity with monitoring and testing tools.

Leads enterprise proxy, perimeter, and SSE/SASE security engineering across US operations. Designs and operates Zero Trust, identity-aware proxy, secure gateway, egress, segmentation, and cloud interconnect architectures. Owns roadmap execution, governance, remediation, lifecycle modernization, incident management, observability, and resiliency. Supervises engineers, establishes reusable security patterns, coordinates cross-functional delivery, and promotes secure, responsible AI-assisted engineering practices.

Provides technical support and guidance to game developers and publishers using PlayStation network services, APIs, tools, and technologies. Investigates and escalates technical issues, collaborates with internal and regional teams, gathers partner feedback, improves developer-facing tools and documentation, automates workflows, and delivers technical training and presentations.

Designs, implements, operates, and maintains Marex’s global network infrastructure. Responsibilities include network consultancy, operational support, security design, troubleshooting, vendor management, cloud networking, automation, infrastructure as code, and reporting. The role supports WAN, campus LAN, firewalls, exchange connectivity, and low-latency networks while ensuring regulatory compliance and operational resilience.

Supports high availability, security, maintenance, and development of the university’s operational technology network and BEMS infrastructure. Responsibilities include network installation, commissioning, troubleshooting, architecture, cybersecurity controls, vulnerability assessments, incident response, documentation, contractor management, risk assessment, and technical guidance. The role collaborates with IT Services, vendors, Estates teams, and building stakeholders to deliver reliable, secure, and efficient campus systems.

Deliver live incident containment and recovery, security assessments, hardening, and managed security solution implementations for clients. Review and secure cloud, identity, firewall, endpoint, and network environments; design Zero Trust, SASE, segmentation, conditional access, and DLP solutions; preserve evidence and support forensic teams; and produce security architecture, deployment, and operational documentation.

Designs, supports, secures, and troubleshoots client and internal WAN/LAN infrastructure, routers, switches, firewalls, IP addressing, VLANs, and Cisco telephony systems. Provides advanced service desk support, handles customer escalations and change requests, documents technical changes, supports network projects, and participates in maintenance activities. The role also manages Cisco Unified Communications Manager, Unity Connection, CUBE gateways, and SIP endpoints while collaborating with customers and engineering teams.

Leads the design, deployment, operation, and optimization of enterprise network security platforms across AWS and on-premises environments. Builds infrastructure automation with Terraform, Python, and Ansible; integrates security controls into CI/CD pipelines; resolves complex infrastructure issues; and supports resilience, compliance, governance, and incident management. Acts as a technical authority, mentors engineers, collaborates with cloud and cybersecurity teams, and helps define network security strategy and standards.