Staff / Senior Software Engineer (Agentic Search) - Runtime

ph3About Nebius: /h3 pNebius 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. /p pBuilt by engineers, for engineers. From large-scale GPU orchestration to inference optimization, we own the hard problems across compute, storage, networking and applied AI. /p pListed on Nasdaq (NBIS) and headquartered in Amsterdam, we have a global footprint with RD 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 RD. /p h3The Product /h3 pIn a rapidly evolving world, trust in AI depends on AI agents being grounded in fresh, verified real-world data. Search is the foundation that makes this possible. /p pWe are building an agent-native search platform designed specifically for AI systems rather than human users. Our product provides programmatic, low-latency, and observable search APIs that AI agents use to retrieve, filter, and reason over real-world information at scale. /p h3The Role /h3 pWe are looking for a Senior Software Engineer to work on the runtime systems of a novel search engine tailored for agentic AI consumption. /p pIn this role, you will focus on building low-latency, high-throughput systems that serve search queries in real time. You will work on the critical path of user-facing requests, where performance, predictability, and efficiency directly impact the product quality. You will design and operate systems that handle thousands of requests per second under strict latency budgets, optimising every layer from request handling to data access and response assembly. /p h3In this position, your responsibility will be to /h3 ul liDesign, implement, and operate core runtime services for serving search queries at scale /li liBuild and optimise request flows, including query processing, retrieval orchestration, and response assembly under strict latency budgets /li liDevelop systems that maintain performance and predictability under high load /li liOptimise CPU, memory, and data access patterns in performance-critical paths /li liEnsure reliability, observability, and predictability across production services /li liBuild well-tested systems with clear responsibilities and interaction contracts, while remaining flexible as architecture evolves /li liDefine and implement observability primitives, including structured logs, metrics, traces, and latency breakdowns /li liMonitor throughput, latency, and resource usage, and drive improvements in performance and cost efficiency /li liCollaborate with indexing and ML teams to integrate retrieval and ranking components, keeping ML logic decoupled from core system internals /li liSupport experimentation and iteration through controlled rollouts and rigorous benchmarking /li /ul h3You may be a good fit if you: /h3 ul liHave 5+ years of experience as a software engineer working on production backend systems /li liHave strong hands-on expertise in C++ or Rust in real-world, high-load services /li liHave built and operated high-load, low-latency user-facing systems handling thousands of RPS under strict latency constraints /li liUnderstand performance at a systems level — CPU, memory, networking, and data access /li liHave operated your own code in production: deployed it, debugged incidents, and rolled back changes when necessary /li liThink end-to-end about request flows rather than staying within isolated components /li liCan balance correctness, latency, and development velocity, making pragmatic tradeoffs when scope or time requires /li liCollaborate effectively across engineering, ML, and product teams, communicating clearly in cross-functional settings /li /ul h3Strong candidates may also have experience with: /h3 ul liDBMS internals (open source or SaaS) and cloud infrastructure /li liHigh-load web applications or large-scale APIs /li liPerformance-critical systems such as trading platforms or real-time data pipelines /li liLow-level performance tuning and hardware-level optimisation /li liOpen-source contributions or active involvement in the engineering community /li liCompetitive programming or CTF participation /li liSHAD or similar advanced technical programmes /li liConference talks or technical publications /li /ul pWe conduct coding interviews as part of the process. /p h3Benefits Perks: /h3 ul liCompetitive compensation /li liCareer growth and learning opportunities /li liFlexibility and ownership /li liCollaborative and innovative culture /li liOpportunity to work on impactful AI projects /li liInternational environment and talented teams /li /ul h3What's it like to work at Nebius: /h3 pFast moving- Bold thinking- Constant growth- Meaningful impact- Trust and real ownership- Opportunity to shape the future of AI /p h3Equal Opportunity Statement: /h3 pNebius 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. /p pApplicants 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. /p pIf you need accommodations during the application process, please let us know. /p /p #J-18808-Ljbffr