HPC Cluster Architect

NexGen Cloud is the company behind Hyperstack, a full-stack AI cloud serving tens of thousands of customers from AI researchers to enterprises running the world's most compute-intensive workloads. We deliver on-demand and private GPU infrastructure to teams who treat performance as a requirement, not a feature. We're a tight-knit, fast-moving team working at the cutting edge of AI cloud infrastructure. We practice what we preach, equipping our people with AI at every level so we can solve harder problems, ship faster, and keep raising the bar for what enterprise GPU infrastructure looks like.

This role exists because NexGen Cloud is winning large-scale dedicated GPU cluster contracts and needs someone who can own the full architecture cycle — from first customer conversation to production deployment. You’ll have direct ownership over cluster architecture across compute, networking, storage, and physical design — translating customer requirements into production-ready, commercially optimised GPU deployments.

Role positioning: This is a senior hands-on role for someone who has lived and breathed HPC cluster design — and who wants to be the technical authority, not one voice in a committee. You’ll own designs end-to-end and see them go live.

WHAT YOU’LL BE DOING

• Own end-to-end cluster architecture for large-scale NVIDIA GPU deployments — from customer requirement through rack layouts, BOM, power and cooling design, to production handover.
• Design high-performance network fabrics across compute (InfiniBand, RDMA, NVLink/NVSwitch), storage, and WAN — defining topology, oversubscription models, and scaling strategies.
• Engage directly with OEMs and vendors — validating hardware configurations, reviewing quotes, and ensuring designs are both technically sound and commercially optimised.
• Provide technical oversight during deployment and bring-up — supporting hardware validation, performance testing, and acting as escalation point for complex integration issues.
• Act as a senior technical leader across Solutions Architecture, Cloud Engineering, and data centre partners — contributing to standardised reference designs and building out the HPC engineering function.

ABOUT YOU: We’re more interested in how you think and work than in a perfect CV. You’ll likely bring a combination of the following:

• Proven experience designing and delivering GPU-based HPC or AI clusters at scale — covering the full lifecycle from design through procurement, deployment, and validation.
• Deep hands-on knowledge of NVIDIA GPU platforms (H100/H200/B-series) and NVIDIA reference architectures.
• Strong InfiniBand/RDMA design experience — topology, performance tuning, and high-performance Ethernet fabrics.
• Solid grounding in Linux systems, PCIe topology, NUMA alignment, and server-level performance considerations.
• Background from an OEM, hyperscaler, neo-cloud, or enterprise/research HPC environment — with demonstrable exposure to the full design-to-deployment lifecycle.
• Confident engaging with customers, vendors, OEMs, and internal engineering teams as a technical authority — able to translate complex design trade-offs into clear decisions.

Nice to Have

• Experience with Spectrum-X or next-generation Ethernet fabrics.
• Prior involvement in large-scale cluster deployments (1,000+ GPUs) and performance benchmarking (NCCL, MLPerf).
• Exposure to both air-cooled and liquid-cooled HPC environments, and/or automation/infrastructure-as-code.

WHAT WE OFFER

• Competitive salary and annual discretionary bonus scheme.
• 25 days of holiday, plus public holidays.
• Flexible working arrangements (remote or hybrid, depending on role and location).
• Real ownership and autonomy, with the trust to take initiative and experiment.
• The opportunity to make a visible, meaningful impact as we scale.
• Clear career progression and growth opportunities in a fast-growing company.
• A collaborative, international culture built on trust, transparency, and ownership.
• The chance to help shape NexGen Cloud’s team, culture, and future alongside ambitious, mission-driven colleagues.