Top Network Engineer Jobs in London

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, support, and maintain enterprise network systems (routers, switches, firewalls, VPNs, cloud networking). Monitor and troubleshoot network performance, implement secure scalable solutions (Zero Trust/SASE), document configurations, collaborate cross-functionally, and participate in on-call rotations to resolve incidents.

Support an EMEA colocation network switch refresh: configure devices in lab, coordinate racking and installs, execute migrations from legacy to new switches, validate post-migration, decommission old equipment, track progress, and coordinate stakeholders during migration windows.

Design and operate multi-region Azure and AWS cloud networking and security for Kubernetes fleets, focusing on isolation, segmentation, egress control, and auditability for agentic AI workloads. Define infrastructure as code with Terraform, harden identity integration, use AI for monitoring and runbooks, and collaborate with Kubernetes and product teams to resolve complex networking issues.

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.

Hands-on Network Engineer supporting a hybrid on-premises and cloud global infrastructure. Design, implement, maintain and troubleshoot LAN/WAN, firewalls, routing, VPNs, WiFi, and related security. Work on incidents, projects, change control, documentation, and provide escalation support across UK, Europe and Asia with close collaboration across infrastructure teams.

Hands-on network engineer supporting a hybrid on-premises and cloud global infrastructure. Design, implement, troubleshoot, upgrade and decommission network appliances/VMs; handle incidents, projects and change requests; collaborate with cloud, data centre and regional teams; maintain WAN, LAN/WiFi, firewall, VPN and security configurations; use ServiceNow and LogicMonitor; perform root cause and problem management to improve availability.

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.

Operate and support low-latency global network infrastructure across on-prem and cloud. Troubleshoot routing, MPLS, firewalls, and packet-level issues; perform incident response, customer onboarding, change execution, monitoring, automation, and deep packet analysis to reduce MTTR and improve observability.

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.

Responsible for designing, implementing and supporting networking solutions across multiple sites, maintaining firewalls, routing and security policies, troubleshooting outages and circuits, performing capacity planning and monitoring, ensuring compliance with public-sector security standards, participating in on-call rotation, and travelling to UK (and occasional international) sites.

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, implement, and operate Virtu’s global low-latency network. Build connectivity across venues, troubleshoot third-party links, and drive automation using configuration management and software collaboration. Improve scale, reliability, and performance while working with software engineers and stakeholders in a fast-paced trading environment.

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.

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.

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.

Provide end-to-end network support for a global client: own and resolve incidents, coordinate with vendors and BT teams, implement designs, troubleshoot routing, switching, wireless, Riverbed and security devices, mentor NOC/Service Desk, and follow change control and security practices.

Implement, test, deploy, troubleshoot and maintain REST API and SIP telecom solutions. Monitor and tune infrastructure for high availability, develop test automation, perform packet/protocol analysis, support deployments and upgrades, participate in Tier 3 on-call rotation, and identify continuous improvement opportunities.

Design, implement, and maintain datacenter, cloud, and office network infrastructure. Configure firewalls, VPNs, peering, multicast, and NAC. Install and cable datacenter hardware, collaborate with infra and dev teams, develop network automation, provide BAU support and on-call coverage, and produce technical documentation.

Optimize and deploy neural-network control policies for humanoid robots: profile and remove inference bottlenecks, port models to new hardware, implement custom kernels, quantize models with minimal quality loss, and propose architecture changes to improve latency and memory usage.

The Network Systems Engineer provides pre-sales technical support, architects networking solutions, conducts presentations, and leads RFP responses for Public Sector customers.

Design and build network automation frameworks, IaC solutions, CI/CD integrations, APIs and observability for large-scale network provisioning and lifecycle management. Partner with Network, Platform and Security teams to ensure reliability and support incident response.

Senior network engineer responsible for designing, implementing and supporting enterprise connectivity across LAN, WAN, data centre, cloud and container platforms. Lead hands‑on engineering, cloud‑native/OpenShift networking, low‑latency trading connectivity, timing systems, monitoring, automation (Ansible/Terraform/Python) and vendor platforms (Cisco, Arista, F5/A10, Palo Alto, Fortinet). Ensure compliance, incident response, operational readiness, and mentor colleagues while contributing to architecture and connectivity roadmap.

Embed with client teams to map and redesign creative workflows, build and deploy AI-powered pipelines integrated with DAMs/CMS and martech. Lead prompt engineering, agent workflows, automation, governance, training, and metrics tracking. Deliver proofs of concept and production-ready solutions, enable adoption, and develop reusable accelerators and practice methodologies.