US Infrastructure & Operations Technical Lead

ROLE OVERVIEW We are seeking a US Infrastructure Operations Technical Lead to drive the operational excellence, technical leadership, and growth of Radiant’s US Infrastructure Operations function. This is a hands-on player-manager role designed for an infrastructure-focused engineering leader with a strong Site Reliability Engineering mindset and deep understanding of large-scale distributed infrastructure environments. Working closely with the UK Infrastructure Operations Manager during overlapping morning hours (US Eastern Time), you will help coordinate cross-regional operations, strategic planning, incident management, and infrastructure delivery across Radiant’s global AI and HPC platform. During US business hours, you will lead and mentor the local Infrastructure Operations team, currently consisting of three engineers, while helping scale operational maturity and team capability as the business continues to grow. The ideal candidate will come from a hyperscale, HPC, or large-scale cloud-native SaaS infrastructure background, with experience operating complex distributed systems at scale. This role requires breadth across datacentre compute, Linux systems, networking, and storage fabrics, with the ability to troubleshoot and lead continuous improvement of our infrastructure. You should be comfortable operating and troubleshooting bare-metal environments, low-latency networking, storage protocols, and core infrastructure technologies underpinning high-performance AI and GPU compute platforms. This role requires strong operational leadership capabilities, including experience running small engineering teams, participating in ITIL-aligned operational processes, and supporting high-availability production environments through structured incident, change, and problem management practices. You will also participate in an on-call rota to lead major incidents, orchestrating technical resources to quickly resolve large scale issues. As Radiant expands its global footprint, your operational leadership, technical expertise, and ability to build high-performing teams will play a critical role in shaping the future of our US infrastructure operations. WHAT’S IN IT FOR YOU Join a globally distributed engineering organisation operating cutting-edge GPU, AI, and high-performance compute infrastructure at scale. As the US Infrastructure Operations Technical Lead, you’ll work hands-on with advanced compute and networking technologies powering large-scale AI and machine learning workloads. This is an opportunity to operate at the forefront of modern infrastructure engineering, helping shape operational standards, automation practices, and reliability engineering across a rapidly scaling global platform. You’ll collaborate with highly skilled engineers across Infrastructure Operations, HPC SRE, Networking, and Platform Engineering teams in an environment that values technical excellence, ownership, and continuous improvement. We move quickly, solve meaningful infrastructure challenges, and provide engineers with the opportunity to influence how next-generation AI infrastructure is designed, operated, and scaled globally. You can also expect: - Exposure to industry-leading GPU and AI infrastructure - Opportunities to help build and scale a growing US operations function - A collaborative, inclusive, and globally connected engineering culture - Real ownership and influence across operational strategy and execution - Work at the intersection of reliability, automation, performance, and scale - A flexible remote-first working environment with ambitious growth plans KEY RESPONSIBILITIES LEADERSHIP & OPERATIONAL OWNERSHIP - Lead a small but high-impact US Infrastructure Operations team, owning both people leadership and technical execution - Ensure 99.9%+ platform uptime across US-region services. - Act as the senior US operational owner for production infrastructure, accountable for reliability, incident outcomes, and day-to-day operational exec