Role overview

Qualifications

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).

Responsibilities

Focus on understanding system behavior across multiple layers, identifying performance bottlenecks, and driving improvements that shape how our clusters are built, operated, tuned, and validated.
Investigate and troubleshoot performance issues of GPU clusters under real workloads (training and inference).
Evaluate and integrate new hardware, system configurations and tuning approaches through software stack.
Support complex performance-related escalations from internal teams and customers.

Key facts

Remote from: Europe
Full time
Senior (5-10 years)
System Engineer
English

Other skills

Communication
Analytical Skills
Teamwork
Innovation
Problem Solving

About the company

Nebius Group

Nebius Group is building one of the largest commercially available AI infrastructure businesses, based in Europe. Our core business is an AI-centric cloud platform built for intensive AI workloads. We are building full-stack infrastructure to service the explosive growth of the global AI industry, including large-scale GPU clusters, cloud platforms and tools and services for developers. Our headquarters and main R&D presence is in Amsterdam, with additional R&D and commercial hubs in Europe, North America and Israel. Our businesses operate and serve customers on four continents. Our name reflects our mission and values as a company. Combining nebula, the Latin word for cloud, with a reference to the endless Möbius strip, the name Nebius embodies our belief in the endless possibilities offered by cloud technologies. In addition to our core AI infrastructure business, we are developing three other businesses that operate under their own distinctive individual brands: • Toloka AI – a data partner for all stages of AI development from training to evaluation; • TripleTen – a leading edtech player in the US and certain other markets, re-skilling people for careers in tech; • Avride – one of the most experienced teams developing autonomous driving technology for self-driving cars and delivery robots. The group is led by Arkady Volozh, the entrepreneur and visionary co-founder of Yandex.

Company details

Company size1001 - 5000

Links

Website LinkedIn See all jobs

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Job description

Why work at Nebius
Nebius is leading a new era in cloud computing to serve the global AI economy. We create the tools and resources our customers need to solve real-world challenges and transform industries, without massive infrastructure costs or the need to build large in-house AI/ML teams. Our employees work at the cutting edge of AI cloud infrastructure alongside some of the most experienced and innovative leaders and engineers in the field.

Where we work
Headquartered in Amsterdam and listed on Nasdaq, Nebius has a global footprint with R&D hubs across Europe, North America, and Israel. The team of over 1400 employees includes more than 400 highly skilled engineers with deep expertise across hardware and software engineering, as well as an in-house AI R&D team.

We are looking for a Senior Systems HPC Engineer to play a key role in building our hyperscaler platform, working across its core components while analyzing and optimizing the performance of large-scale GPU clusters at the intersection of hardware and software.

You will operate across the full stack—from hardware and system software to networking (InfiniBand/RoCE), virtualization (KVM/QEMU), and distributed communication layers (e.g., MPI, NCCL).

In this role you will

Focus on understanding system behavior across multiple layers, identifying performance bottlenecks, and driving improvements that shape how our clusters are built, operated, tuned, and validated.
Investigate and troubleshoot performance issues of GPU cluster under real workloads (training and inference)
Evaluate and integrate new hardware, system configurations and tuning approaches through software stack
Support complex performance-related escalations from internal teams and customers
Work closely with infrastructure, software engineering and hardware vendor teams (e.g. NVIDIA, Mellanox, Intel)
Contribute to hardware and cluster qualification (acceptance), ensuring systems meet performance expectations

We expect you to have:

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).

We conduct coding interviews as part of the process.

What we offer

Competitive salary and comprehensive benefits package.
Opportunities for professional growth within Nebius.
Flexible working arrangements.
A dynamic and collaborative work environment that values initiative and innovation.

We’re growing and expanding our products every day. If you’re up to the challenge and are excited about AI and ML as much as we are, join us!