Lead Software Systems Engineer - GPU Performance

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.

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 are looking for a Lead Software Systems Engineer - GPU Performance 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.

Key employee benefits:

* Health insurance: 100% company-paid medical, dental and vision coverage for

employees and families.

* 401(k) plan: Up to 4% company match with immediate vesting.

* Parental leave: 20 weeks paid for primary caregivers, 12 weeks for secondary

caregivers.

* Remote work reimbursement: Up to $85/month for mobile and internet.

* Disability & life insurance: Company-paid short-term, long-term and life

insurance coverage.

Compensation

We offer competitive salaries ranging from $170k-$300k OTE + equity based on

your experience.

Pay Transparency

We offer competitive compensation and benefits packages. Actual compensation

will be determined based on job-related factors, including experience, skills,

qualifications, the level at which the candidate is hired, and geographic

location, consistent with applicable law.

Base Compensation Range

$170,000—$300,000 USD

Benefits

& Perks:

* Competitive compensation

* Career growth and learning opportunities

* Flexibility and ownership

* Collaborative and innovative culture

* Opportunity to work on impactful AI projects

* International environment and talented teams

What's it like to work at Nebius:

Fast moving - Bold thinking - Constant growth - Meaningful impact - Trust and

real ownership - Opportunity to shape the future of AI

Equal Opportunity Statement:

Nebius is an equal opportunity employer. We are committed to fostering an

inclusive and diverse workplace and to providing equal employment opportunities

in all aspects of employment. We do not discriminate on the basis of race,

color, religion, sex (including pregnancy), national origin, ancestry, age,

disability, genetic information, marital status, veteran status, sexual

orientation, gender identity or expression, or any other characteristic

protected by applicable law.

Applicants must be authorized to work in the country in which they apply and

will be required to provide proof of employment eligibility as a condition of

hire.

If you need accommodations during the application process, please let us know.