{"id":2243752,"url":"https://alion.io/job/nebius-staff-senior-software-engineer-agentic-search-runtime-2","title":"Staff / Senior Software Engineer (Agentic Search) - Runtime","company":{"id":6364,"name":"Nebius","domain":"nebius.com","url":"https://alion.io/company/nebius","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":78,"open_postings":131,"ghost_share":0,"stale_share":0.87,"repost_share":0,"time_to_fill_p50_days":38,"computed_at":"2026-10-13T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"staff","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Zurich, Switzerland","Netherlands","United Kingdom"],"countries":["CH","NL","GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":196000,"max_usd":414000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":2065},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"C++","optional":false},{"name":"Rust","optional":false}],"status":"live","first_seen_at":"2026-09-16T12:10:33Z","employer_posted_date":"2026-10-08","last_verified_at":"2026-10-13T09:40:11Z","board_verified":true,"closed_at":null,"days_open":26,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":26},"description":"About Nebius:\nNebius 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.\nBuilt by engineers, for engineers. From large-scale GPU orchestration to inference optimization, we own the hard problems across compute, storage, networking and applied AI.\nListed 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.\nThe Product\nIn 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.\nWe 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.\nThe Role\nWe are looking for a Senior Software Engineer to work on the runtime systems of a novel search engine tailored for agentic AI consumption.\nIn 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 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.\nIn this position, your responsibility will be to\nDesign, implement, and operate core runtime services for serving search queries at scale\nBuild and optimise request flows, including query processing, retrieval orchestration, and response assembly under strict latency budgets\nDevelop systems that maintain performance and predictability under high load\nOptimise CPU, memory, and data access patterns in performance-critical paths\nEnsure reliability, observability, and predictability across production services\nBuild well-tested systems with clear responsibilities and interaction contracts, while remaining flexible as architecture evolves\nDefine and implement observability primitives, including structured logs, metrics, traces, and latency breakdowns\nMonitor throughput, latency, and resource usage, and drive improvements in performance and cost efficiency\nCollaborate with indexing and ML teams to integrate retrieval and ranking components, keeping ML logic decoupled from core system internals\nSupport experimentation and iteration through controlled rollouts and rigorous benchmarking\nYou may be a good fit if you:\nHave 5+ years of experience as a software engineer working on production backend systems\nHave strong hands-on expertise in C++ or Rust in real-world, high-load services\nHave built and operated high-load, low-latency user-facing systems handling thousands of RPS under strict latency constraints\nUnderstand performance at a systems level - CPU, memory, networking, and data access\nHave operated your own code in production: deployed it, debugged incidents, and rolled back changes when necessary\nThink end-to-end about request flows rather than staying within isolated components\nCan balance correctness, latency, and development velocity, making pragmatic tradeoffs when scope or time requires\nCollaborate effectively across engineering, ML, and product teams, communicating clearly in cross-functional settings\nStrong candidates may also have experience with:\nDBMS internals (open source or SaaS) and cloud infrastructure\nHigh-load web applications or large-scale APIs\nPerformance-critical systems such as trading platforms or real-time data pipelines\nLow-level performance tuning and hardware-level optimisation\nOpen-source contributions or active involvement in the engineering community\nCompetitive programming or CTF participation\nSHAD or similar advanced technical programmes\nConference talks or technical publications\nWe conduct coding interviews as part of the process.\nBenefits & Perks:\nCompetitive compensation\nCareer growth and learning opportunities\nFlexibility and ownership\nCollaborative and innovative culture\nOpportunity to work on impactful AI projects\nInternational environment and talented teams\nWhat's it like to work at Nebius:\nFast moving - Bold thinking - Constant growth - Meaningful impact - Trust and real ownership - Opportunity to shape the future of AI \nEqual Opportunity Statement:\nNebius 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. 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