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About the Role

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

Responsibilities

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, while remaining flexible as architecture evolves
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, keeping ML logic decoupled from core system internals
Support experimentation and iteration through controlled rollouts and rigorous benchmarking

Requirements

Have 8+ years of experience as a software engineer working on production backend systems
Have strong hands-on expertise in C++ or Rust in real-world, high-load services
Have built and operated high-load, low-latency user-facing systems handling thousands of RPS under strict latency constraints
Understand performance at a systems level — CPU, memory, networking, and data access
Have operated your own code in production: deployed it, debugged incidents, and rolled back changes when necessary
Think end-to-end about request flows rather than staying within isolated components
Can balance correctness, latency, and development velocity, making pragmatic tradeoffs when scope or time requires
Collaborate effectively across engineering, ML, and product teams, communicating clearly in cross-functional settings
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.

Skills

C++
Rust
DBMS internals
cloud infrastructure
High-load web applications
large-scale APIs
Performance-critical systems
Low-level performance tuning
hardware-level optimisation
Open-source contributions
active involvement in the engineering community
Competitive programming
CTF participation
SHAD
technical programmes
Conference talks
technical publications

Experience Level

8+ years of experience

Benefits

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

About the Company

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.
Fast moving - Bold thinking - Constant growth - Meaningful impact - Trust and real ownership - Opportunity to shape the future of AI

Equal Opportunity

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.