Senior ML Engineer (Agentic Search)

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 seeking a Senior ML Engineer to join a fast-growing team building an agent-native search platform for AI systems, the emerging web access layer for AI.

You will develop and deploy machine learning models that power retrieval, ranking, and indexing at scale, helping AI systems access fresh, reliable information in real time.

This is a high-impact role working on a production system used 24x7, tackling challenges comparable to large-scale web search.

Your responsibilities:

Design, train, and deploy ML models for retrieval, reranking, and search relevance in production

Build and optimise embedding-based indexing and large-scale retrieval systems

Develop models supporting crawling, data selection, and content understanding

Define and improve quality metrics for agent-native search and build evaluation pipelines

Work on systems operating at very large scale, including high-throughput query workloads

Collaborate closely with engineering teams to integrate ML models into production services

Analyse performance trade-offs across latency, quality, and cost

Experiment with and apply state-of-the-art techniques in search, retrieval, and LLM-integrated systems

Contribute to product and architectural decisions in a fast-moving environment

Must-haves:

5+ years of experience in software engineering or applied machine learning

Strong programming skills in Python, Go, or C++

Proven experience deploying ML models in production systems

Hands-on experience with retrieval, ranking, recommendation, or similar ML problems

Strong understanding of machine learning and modern deep learning techniques

Experience working with large-scale data systems and high-throughput environments

Ability to design evaluation frameworks and define meaningful model metrics

Product-oriented mindset with a focus on impact and iteration

Strong problem-solving skills and ability to work in a distributed team

Nice-to-haves:

Experience with search systems or large-scale information retrieval

Familiarity with embeddings, transformers, and modern NLP systems

Experience working on LLM-powered or agent-based systems

Contributions to open-source projects, technical publications, or conference talks

Participation in competitive ML (e.g. Kaggle) or similar signals of strong technical ability

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.

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