Senior Network Engineer

Company Overview:Radiant is redefining how AI infrastructure is built.We design and operate AI-native cloud platforms engineered for sovereignty, performance, and scale. Our infrastructure powers GPU-native workloads, multi-tenant control planes, and high-performance AI systems designed for the most demanding environments.We are not building a generic cloud. We are building purpose-built AI infrastructure - from powered land, to compute, to software .As we scale our platform and expand our engineering organisation, we are looking for leaders who can build strong teams, uphold high standards, and deliver reliably at pace.Job DescriptionAs a Senior Network Engineer, you’ll design, deploy, and operate the high-performance, low-latency network fabric that underpins our GPU infrastructure. You’ll play a critical role in shaping the architecture, automation, and operational standards of our network, ensuring it meets the rigorous demands of modern AI training and inference workloads.The ideal candidate is a strong advocate of engineering excellence and operational best practices. You’re customer-focused, collaborative, and equally comfortable discussing technical issues with enterprise customers, internal teams, and cross-functional stakeholders. You’ll contribute to everything from design and implementation through to L3/L4 operational support.Role Responsibilities Network Architecture & Collaboration: Design scalable leaf-spine networks using Mellanox switches with Cumulus Linux, integrated with Juniper PTX routers and SRX firewalls. Lead 3rd party and internal provider collaboration to deploy resilient site-to-site and internet connectivity, optimise topology, and resolve complex faults.Operations & Maintenance: Perform configuration, upgrades, and deep troubleshooting of Juniper and NVIDIA/Cumulus devices in production environments.Software-Defined Networking (SDN): Implement programmable network designs using controller-based platforms to support automation and scala