Senior HPC Engineer - GPU Clusters & InfiniBand (Remote)

NexGen Cloud Ltd.; United Kingdom; Remote; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Salary & bonus

Private medical insurance

Pension scheme

Flexible working

Ownership & autonomy

Impact & growth

Career progression

Collaborative culture

International team

Job summary

NexGen Cloud Ltd. in the United Kingdom is seeking an experienced HPC Engineer to validate and tune large-scale NVIDIA GPU clusters, owning the HPC layer in production.

You will work on Slurm, NCCL, InfiniBand and storage, ensuring performance meets strict criteria before handover to customers. This remote role reports to the Head of Infrastructure and offers ownership, autonomy, and a chance to shape next-gen AI infrastructure across global workloads.

Qualifications

• Hands-on experience operating NVIDIA GPU infrastructure at scale, including drivers, CUDA, DCGM and diagnosing GPU hardware faults.
• Proven experience running production HPC clusters with a workload manager such as Slurm.
• Strong practical InfiniBand experience, including subnet management, RDMA, fabric monitoring and fault-finding.

Responsibilities

• Own cluster performance from acceptance to production, running burn-in, health checks and NCCL, HPL and storage benchmarks against agreed criteria, and resolving underperformance before a cluster reaches the customer.
• Collaborate with Deployment Solution Architects, Network Engineers, Validation, Customer Support and vendors including NVIDIA to resolve issues quickly.
• Run the production HPC layer day to day: Slurm, GPU drivers, CUDA stack, InfiniBand fabrics and storage clusters depend on.
• Tune clusters for AI training and HPC workloads, from NCCL settings and GPUDirect RDMA to topology-aware scheduling and storage throughput.
• Build GPU, fabric and job-level monitoring that catches faults before customers notice, and lead incident response from Xid errors and fabric degradation through to root cause.

Skills

NVIDIA GPUs

Slurm workload manager

InfiniBand networking

NCCL benchmarks

Linux system administration

Git workflows

GPU drivers

Tools

Slurm

NVIDIA CUDA

InfiniBand

GPUDirect RDMA

Job description

NexGen Cloud Ltd. in the United Kingdom is seeking an experienced HPC Engineer to validate and tune large-scale NVIDIA GPU clusters, owning the HPC layer in production.

You will work on Slurm, NCCL, InfiniBand and storage, ensuring performance meets strict criteria before handover to customers. This remote role reports to the Head of Infrastructure and offers ownership, autonomy, and a chance to shape next-gen AI infrastructure across global workloads.