Senior HPC Engineer, GPU Compute

About Nebius

Nebius is leading a new era in cloud infrastructure for the global AI economy. We are building a full-stack AI cloud platform that supports developers and enterprises from data and model training through to production deployment, without the cost and complexity of building large in‑house AI/ML infrastructure.

Nebius is leading a new era in cloud infrastructure for the global AI economy. We are building a full-stack AI cloud platform that supports developers and enterprises from data and model training through to production deployment, without the cost and complexity of building large in‑house AI/ML infrastructure.

Built by engineers, for engineers. From large‑scale GPU orchestration to inference optimization, we own the hard problems across compute, storage, networking and applied AI.

Listed on Nasdaq (NBIS) and headquartered in Amsterdam, we have a global footprint with R&D hubs across Europe, the UK, North America and Israel. Our team of 1,500+ includes hundreds of engineers with deep expertise across hardware, software and AI R&D.

We’re looking for a Senior HPC Cluster Engineer to join our team and play a key role in the development of our cutting‑edge hyperscaler platform. The GPU & Infini Band team is responsible for enhancing and optimizing the core components of our Cloud platform, with a specific focus on GPU computing, Infini Band networks, and the KVM/QEMU stack. You’ll work closely with hardware virtualization and device emulation technologies, ensuring high performance and security in multi‑GPU, HPC environments.

The role involves analyzing, troubleshooting, and improving infrastructure to support new hardware, fine‑tuning system performance, and automating fault detection and resolution in a complex system.

• Tuning the performance of GPU clusters and Infini Band networks to ensure optimal operation in HPC and GPU‑based environments.
• Analyzing and troubleshooting the root cause of issues related to GPUs and Infini Band networks, and proposing corrective actions.
• Integrating new hardware into the existing infrastructure, including support for new GPU hardware through software stacks like Kubernetes, QEMU, and KVM.
• Enhancing automation systems for proactive monitoring, detecting, and resolving issues in GPU and Infini Band environments.
• Configuring and managing GPU devices and Infini Band fabrics, ensuring efficient and reliable operation.

• 5+ years of professional experience in system‑level software development (focused on performance optimization, low‑level programming).
• 3+ years of hands‑on experience with Linux systems (administration, troubleshooting, and performance tuning).
• In‑depth understanding of server architecture, including PCIe devices, NICs, Linux OS/Kernel, and high‑performance computing (HPC) systems.
• Strong proficiency in one or more performance‑oriented programming languages (C/C++, Go, Python).

• Experience with GPU end‑to‑end testing in a cluster environment using Infini Band networking.
• Proven track record of analyzing and optimizing the performance of HPC workloads (e.g., simulations, data analysis, AI/ML workloads).
• Familiarity with RDMA, RoCE, and Infini Band protocols for high‑performance communication.
• Background in Software‑Defined Networking (SDN) and experience with HPC cluster networking.
• Understanding of QEMU/KVM virtualization and managing virtualized environments.
• Experience with deep learning frameworks such as PyTorch and Tensor Flow, and their integration with HPC systems.
• Familiarity with collective communication libraries like MPI and NCCL for distributed computing.

We conduct coding interviews as part of the process.

• Competitive…