Data Center Architect

Job description

Role Profile Job Title: Data Centre Architect Reports to: Head of Data Centre Development Location: UK hybrid 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, we’re building this organisation from the ground up. We’re looking for people who’d rather build the playbook than inherit one — who are comfortable doing the work themselves as well as directing others, and who can adapt as fast as our strategy does. This is a startup model: attitude and adaptability matter more to us than years of experience or the size of team you’ve previously managed. This is a senior individual contributor role with authority to sign off technical schedules, working with cluster and network architects, NVIDIA and other OEM engineers, colocation provider engineering and sales teams, and the internal Procurement, Legal, Finance and Site Operations teams. What You’ll Do You will be the single technical authority between our GPU-as-a-service business and the colocation providers that host our NVIDIA clusters. You turn cluster architecture and OEM requirements into a precise, contractable statement of work (SOW) for the data centre white space, then hold the provider to it through design, installation and acceptance. We are growing from tens of megawatts to hundreds, on rack-scale liquid-cooled platforms at 130 kW per rack and rising to 200 kW and beyond. Mistakes in power, cooling or fibre specification show up as stranded capacity, delayed cluster delivery and disputes, so the role carries real commercial weight. Key Responsibilities Technical negotiation with colocation providers Lead technical due diligence on candidate sites: power availability and energisation dates, redundancy topology, liquid-cooling capability, floor loading, rack logistics, fibre and meet-me access. Negotiate the technical schedules of the colocation agreement with commercial and legal: capacity and density commitments, power and cooling SLAs, temperature and flow envelopes, metering, expansio…