Senior Software Engineer (Agentic Search) – Web Rendering (Chromium)

About the Position

We are looking for a Senior Software Engineer to work on the rendering infrastructure of a novel search engine tailored for agentic AI consumption. In this role, you will focus on optimizing Chromium to ensure high-quality content is consistently available to the indexing and retrieval systems downstream.

About Nebius

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. 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.

The Product

In 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. We 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.

Responsibilities

• Change Chromium in its heavy core (Blink, the V8 integration, the compositor, the network service) to cut CPU, memory, and startup cost per page
• Strip Chromium down for agent workloads: skip what nobody needs, such as image and media decoding, web font downloads, and rasterization and GPU work where no one needs pixels, while keeping what page scripts depend on to run correctly (style, layout, animation frames, observers), and work out what breaks, or renders differently, when you do
• Keep the browser compatible with the web: make sure that what we remove does not change how the sites we load behave or render
• Profile and tune fleets of browsers: the process model, memory per renderer, startup, isolation, and crash handling
• Build the production system around it: how browsers are launched, pooled, recycled, and monitored

Requirements

• 5+ years of experience building production systems
• Strong C++ in a large, performance-critical codebase, ideally Chromium, Blink, or V8, or a comparable browser engine (Rust is a plus)
• Chromium architecture: the process model, Mojo IPC, the rendering pipeline (DOM, style, layout, paint, compositing), and the network service
• Building, debugging, and shipping custom Chromium builds: the build system, tracing, crash analysis, and maintaining patches across releases
• Profiling CPU, memory, and I/O for browser fleets, with tools such as perf, tracing, and flame graphs
• Linux process isolation and resource management, concurrency, and memory management
• Have run browsers in production, or built the infrastructure that does, and can describe where the time and memory went

Nice to Have

• Contributions to Chromium, Blink, V8, Firefox, WebKit, or another browser engine
• Building or maintaining a patched browser that you wrote the patches for
• Browser instrumentation, including the Chrome DevTools Protocol
• Working familiarity with how modern frontend frameworks render (SSR, CSR, streaming, hydration)
• Distributed systems, Kubernetes, and Go or Python

We Offer

• 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

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

Equal Opportunity Statement

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.

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.

Locations

• Israel
• Netherlands
• United Kingdom
• Remote - Europe

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