Top Network Engineer Jobs in London

Design, build, automate, and operate cloud-native network infrastructure to ensure reliability, performance, and observability. Drive test-driven infrastructure changes, support office networking, participate in on-call rotations, incident escalations, code/config reviews, and produce documentation and playbooks for the engineering organization.

Designs, deploys, and supports global enterprise network infrastructure spanning LAN, WAN, wireless, firewalls, load balancing, and security. Owns network projects from requirements through implementation and handoff, manages vendors, supports office build-outs, and travels globally as needed. Implements monitoring, SIEM, compliance, incident response, automation, and infrastructure-as-code practices. Serves as an escalation point for complex wired and wireless issues while contributing to maintenance, upgrades, documentation, and operational improvements.

Build and operate Internet-scale systems terminating HTTP and TLS, migrate infrastructure from NGINX to a Rust-based proxy, improve protocol performance, and contribute to open-source projects and industry standards. The role involves complex systems programming, reliable and secure software development, and collaboration with leading networking engineers.

Build, operate, and scale CrowdStrike's global backbone and hybrid cloud networks. Design and implement IP and optical solutions, drive capacity planning, evaluate technologies, automate with IaC and CI/CD, support cloud networking, lead projects from ideation to implementation, and participate in 24x7 on-call rotation.

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.

Provides deep technical leadership for QRT’s global trading and enterprise networks. Leads complex investigations involving performance, latency, resilience, and operations; serves as a senior escalation point; translates architecture standards into automation, validation, documentation, and runbooks; supports migrations and technical improvements; evaluates technologies; develops instrumentation; and mentors network engineers.

Maintain and improve enterprise network infrastructure, own network systems and core services, troubleshoot escalated issues, support projects and change delivery, contribute to design and automation (IaC), remediate security vulnerabilities, and collaborate with stakeholders to drive performance, resilience and service improvements.

Designs, deploys, and supports large-scale, highly available enterprise and media networks. Responsibilities include advanced troubleshooting, Tier 2 and Tier 3 escalation support, network automation, capacity planning, security analysis, monitoring, documentation, cloud connectivity, and cross-network media asset workflows. The engineer supports multi-vendor infrastructure across WAN, LAN, MAN, storage, streaming, VPN, and virtualized network environments, participates in on-call coverage, and collaborates with production, systems, cloud, and media engineering teams.

Own the reliability, performance, resilience, observability, automation, and security of enterprise network infrastructure. Design and maintain Cisco and Arista datacenter networks, support WAN connectivity, automate operations with Python and Ansible, extend infrastructure-as-code and CI/CD practices, and lead incident response, on-call operations, postmortems, and root-cause analysis for complex network issues.

Lead design, build, and operate enterprise perimeter, proxy, and SSE/SASE security solutions. Architect ZTNA/IAP patterns, integrate SWG capabilities, enforce identity- and context-based policies, drive governance, roadmap, cross-team delivery, operational excellence, and adoption of AI-assisted engineering practices to improve security, stability, and automation.

Join Qube Research & Technologies as a Network Engineer responsible for designing large-scale datacentre networks, ensuring high-performance connectivity, and collaborating with teams to enhance infrastructure and troubleshooting.

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.

Provide advanced out-of-hours support for customer network and security environments. Troubleshoot SD-WAN, firewall, routing, switching, ISP, and security incidents; handle P1/P2 emergencies; implement changes and project tasks; perform upgrades and hardware replacements; manage ISP circuits; and maintain technical documentation. The role is remote, UK-based, and requires night-shift work with independent customer support and incident resolution.

Design, deploy, and operate lossless RDMA-capable leaf-spine fabrics for multi-tenant GPU clusters. Automate provisioning, build telemetry/observability, troubleshoot end-to-end performance, manage out-of-band and office networks, support tenant onboarding, and document designs while upskilling colleagues.

Own the network layer of physical data-centre deployments, including on-site switch and firewall installation and configuration, carrier and fibre circuit activation, and external operator relationships. Serve as the primary on-site contact for network contractors and providers, coordinating closely with deployment and data-centre operations teams to bring sites into production.

Build and extend high-scale egress-path systems running on Linux kernel and network dataplanes. Work on kernel network stack (eBPF), routing (BGP), and distributed systems to optimize packet flow, reliability, and performance. Collaborate across teams and participate in on-call rotation.

Support post-sales network solution engineering: translate designs into implementation plans, analyze customer network data, assist deployments, reconfigurations, and migrations, troubleshoot deployment package issues, and coordinate across engineering, field, and support teams under senior supervision.

Design, maintain, and optimize HLR/HSS/UDM subscriber templates and roaming logic. Lead Full MVNO profile deployments, collaborate with roaming partners and system integrators, define HLR/HSS KPIs, and troubleshoot signalling using Wireshark and roaming platforms.

Design, operate, troubleshoot, and automate secure enterprise routing, switching, wireless, WAN, and cloud connectivity. Balance platform architecture, standards, lifecycle planning, and automation with incident response, change safety, and operational delivery. Reduce recurring reactive work through software, APIs, Infrastructure-as-Code, Git workflows, testing, and CI/CD.

The Staff Network Engineer designs and optimizes global office networks, ensuring 99.9% uptime, and promotes security through Zero Trust Access while managing significant hardware investments.

Design, integrate, and support SCADA and OT networks for battery energy storage systems across EMEA. Lead system architecture, testing, troubleshooting, documentation, and customer technical interfaces. Monitor performance, drive root-cause analyses and continuous improvements, and support upgrades, lab testing, and field service activities with occasional travel.

Provide day-to-day incident and change support for enterprise network infrastructure in a regulated financial-services environment. Design, document, build, transition, configure, and support production, non-production, and disaster-recovery networks. Work across Cisco routing and switching, ACI, Meraki, Check Point firewalls, F5 load balancing, DNS, DHCP, SDN, automation, Infrastructure-as-Code, observability, and secure internet-facing services.

Provides enterprise network engineering and operations for a regulated UK financial-services environment. Responsibilities include incident and change support, network design, documentation, installation, configuration, live transition, and ongoing support across production, non-production, and disaster-recovery infrastructure. The role requires hands-on expertise with Cisco, ACI, Meraki, Check Point, F5, LAN/WAN, DNS, DHCP, network security, automation, Infrastructure-as-Code, and observability.

Build and design proxy infrastructure from scratch, implement rotation systems, manage IP reputation, optimize for performance, and develop reverse proxy systems for various proxy types.

Design, build and operate highly available low-latency co-location network infrastructure. Optimize performance, timing and throughput; implement packet-capture and market connectivity; develop automation and tooling; monitor lifecycle and reliability; collaborate with platform teams; contribute to incident response and on-call support.