Principal Engineer – Scale-Up GPU Networking (HPC / AI)

Principal Engineer – Scale-Up GPU Networking (HPC / AI) This role has been designed as 'Hybrid' with a requirement that you will work on average 2 days per week from an HPE office. Who We Are: Hewlett Packard Enterprise is the global edge-to-cloud company advancing the way people live and work. We help companies connect, protect, analyze, and act on their data and applications wherever they live, from edge to cloud, so they can turn insights into outcomes at the speed required to thrive in today’s complex world. Our culture thrives on finding new and better ways to accelerate what’s next. We know varied backgrounds are valued and succeed here. We have the flexibility to manage our work and personal needs. We make bold moves, together, and are a force for good. If you are looking to stretch and grow your career our culture will embrace you. Open up opportunities with HPE. Job Description: High Performance Computing, AI and Labs is a critical element of HPE. We are focused on delivering innovative solutions that accelerate our customers’ digital transformation, enabling them to tackle their complex, and data-intensive workloads. Combining deep expertise and the development of the world’s most cutting-edge, high-performance supercomputers, is defining the next era of computing delivering valuable insight & innovation. Join us and redefine what’s next for you. What you'll do: Key Responsibilities Architect & Deliver Scale-Up Networking Design and implement GPU-aware networking paths for high-bandwidth, low-latency intra-node communication. Develop and optimize GPU → NIC → GPU data movement, shared memory models, and DMA pathways. GPU Ecosystem Integration Work with NVIDIA CUDA, NVLink, NCCL, and AMD ROCm, InfinityFabric, RCCL teams to integrate and optimize scale-up communication semantics. Drive improvements to DMA engines, BAR mappings, ATS/IOMMU, and GPU memory registration workflows. Runtime & Communication Stack Development Enhance and extend Libfabric, UCX, CXI, SHMEMX, OpenMPI for GPU-accelerated scale-up workflows. Optimize communication collectives, transport layers, and GPU-direct capabilities. Multi-NIC / NUMA Performance Optimization Characterize and tune multi-NIC per socket, NUMA-zone mapping, GPU locality, CQ/queue design, and CPU/GPU topology optimization. Upstreaming & Architecture Influence Lead upstream contributions to open-source projects (OFI, UCX, OpenMPI, RCCL/NCCL enablement). Partner with HPC/AI ecosystem teams to shape future architectures. Debugging, Performance, and Quality Own complex debugging across driver, runtime, GPU, kernel, and user-space boundaries. Develop profiling workflows using Nsight, ROCm tools, eBPF, perf, etc. What you need to bring: Required Skills & Experience 10–15+ years building high-performance networking, GPU, or kernel-level software. Deep expertise in C/C++, Linux internals, memory management, RDMA, PCIe, IOMMU, ATS, DMA engines.