Data Center Architect

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.

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.

• 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, expansion rights, change control and remedies.
• Challenge provider claims with evidence: single-line diagrams, P&IDs, load-bank and commissioning records, reference customers.

• Work with cluster architects and OEMs (NVIDIA first) to capture rack, power, cooling, network and layout requirements, and keep them current across product generations.
• Write and own the technical SOW for white-space fitout: containment and cooling interfaces, power distribution to rack, structured cabling and pathways, rack and POD layout, security zoning, labelling and records.
• Define clear scope boundaries and responsibilities between us, the colocation provider, OEMs and installation contractors, with no gaps and no overlaps.
• Maintain a requirements baseline with traceability from OEM document, to SOW clause, to acceptance test.

• Review provider and contractor designs, shop drawings and method statements against the SOW; run design reviews and close findings.
• Define acceptance: factory and site tests, liquid flush and cleanliness, power quality, thermal performance at full load, fibre loss, burn-in, and the evidence pack needed for each gate.
• Attend key witness tests and sign off, or reject, completion of each phase before hardware is energised.
• Manage technical change requests and variations, and advise on cost and schedule impact.