[Hiring] Applied AI Research Lead @Nebius

Role Description

We are seeking an Applied AI Research Lead to join a fast-growing team building an agent-native search platform for AI systems, the emerging web access layer for AI.

Depending on your experience and scope, this role can be scoped at Staff or Principal level, with the opportunity to act as a technical lead for applied AI research within the team.

You will lead applied research that directly improves how AI systems retrieve, reason over, and use real-world information. This is a highly impactful role focused on production systems, where research is tightly coupled with real-world deployment at scale.

You will work on problems at the intersection of search, retrieval, and LLM-based systems, shaping how AI agents access and interact with the web. This includes:

• Advancing retrieval pipelines
• Ranking systems
• Grounding techniques
• Evaluation frameworks for agent-native workloads

Your responsibilities:

• Drive applied research across retrieval, ranking, and agent-centric search systems
• Design and improve multi-stage retrieval pipelines, including query understanding, rewriting, and reranking
• Develop approaches for grounding LLMs using real-time web data
• Define and implement evaluation methodologies and quality metrics for agent-native search
• Lead experimentation on modern retrieval techniques such as hybrid search, embedding-based systems, and cross-encoders
• Work closely with engineering teams to bring research into production at scale
• Analyse trade-offs across relevance, latency, and cost in large-scale systems
• Contribute to long-term research and product direction
• Mentor engineers and researchers and raise the technical bar of the team

Qualifications

• 8+ years of experience in applied AI, machine learning, or software engineering
• Strong track record of shipping ML or AI systems into production, not purely research
• Deep experience in retrieval, ranking, search relevance, or recommendation systems
• Strong understanding of modern deep learning approaches including transformers and embeddings
• Experience working with LLM-integrated systems or knowledge-intensive AI applications
• Hands-on experience designing evaluation frameworks and defining meaningful metrics
• Strong programming skills in Python, Go, or C++
• Ability to operate in a product-driven, fast-moving environment
• Strong ownership and ability to drive ambiguous problems end-to-end

Requirements

• Experience with large-scale search systems such as web search, marketplaces, ads, or assistants
• Background in agentic AI systems or AI agents such as coding or research agents
• Familiarity with RAG systems, multi-step retrieval, and tool use
• Experience with query understanding, personalization, or recommendation systems
• Publications, conference talks, or open-source contributions
• Participation in competitive programming or ML competitions such as Kaggle

Benefits

• 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