Senior Software Engineer (Agentic Search) - Runtime

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. We are looking for a Senior Software Engineer to work on the runtime systems of a novel search engine tailored for agentic AI consumption.

• Design, implement, and operate core runtime services for serving search queries at scale
• Build and optimise request flows, including query processing, retrieval orchestration, and response assembly under strict latency budgets
• Develop systems that maintain performance and predictability under high load
• Optimise CPU, memory, and data access patterns in performance-critical paths
• Ensure reliability, observability, and predictability across production services
• Build well-tested systems with clear responsibilities and interaction contracts
• Define and implement observability primitives, including structured logs, metrics, traces, and latency breakdowns
• Monitor throughput, latency, and resource usage, and drive improvements in performance and cost efficiency
• Collaborate with indexing and ML teams to integrate retrieval and ranking components
• Support experimentation and iteration through controlled rollouts and rigorous benchmarking

• 5+ years of experience as a software engineer working on production backend systems
• Strong hands-on expertise in C++ or Rust in real-world, high-load services
• Experience with high-load, low-latency user-facing systems handling thousands of RPS under strict latency constraints
• Understanding of performance at a systems level — CPU, memory, networking, and data access
• Experience deploying, debugging, and rolling back code in production
• Ability to think end-to-end about request flows

• 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