We are looking for a Senior Software Engineer to build the web access infrastructure behind a novel search engine designed for agentic AI.

In this role, you will investigate how modern websites communicate with browsers and translate that understanding into production systems operating at internet scale. You will build browser infrastructure and tooling that enables reliable, efficient access to web content across a rapidly changing web.

Responsibilities

Research and analyse how modern websites communicate with browsers across the complete request lifecycle
Investigate browser fingerprinting, client verification mechanisms, and modern web technologies to enable reliable web access
Build tooling for browser instrumentation, debugging, observability, and large-scale experimentation
Translate technical research into production systems operating at internet scale

Requirements

You have 5+ years of experience as a software engineer working on production backend or infrastructure systems, and are an expert in several of the following areas:
Browser Technologies
- Chromium architecture and browser internals
- Browser lifecycle and navigation
- Chrome DevTools Protocol (CDP)
- Playwright, Puppeteer, Selenium, or similar browser automation frameworks
- Browser instrumentation and debugging
Web Platform
- HTTP/1.1, HTTP/2, HTTP/3 — TLS, DNS, and browser networking
- Cookies, browser storage, caching, redirects, and session management
- JavaScript execution and modern client-side rendering
- Resource loading, page lifecycle, and browser networking
- Browser fingerprinting concepts and browser characteristics

Nice to Have

Experience working on browser engines or browser infrastructure
Experience reverse engineering browser or web application behaviour
Experience building internet-scale distributed systems
Go, C++, Rust, or Python
Kubernetes and cloud infrastructure
5+ years of experience as a software engineer working on production backend or infrastructure systems, Expertise in Chromium architecture and browser internals, Expertise in browser lifecycle and navigation, Expertise in Chrome DevTools Protocol (CDP), Expertise in Playwright, Puppeteer, Selenium, or similar browser automation frameworks, Expertise in browser instrumentation and debugging, Expertise in HTTP/1.1, HTTP/2, HTTP/3, TLS, DNS, and browser networking, Expertise in cookies, browser storage, caching, redirects, and session management, Expertise in JavaScript execution and modern client-side rendering, Expertise in resource loading, page lifecycle, and browser networking, Expertise in browser fingerprinting concepts and browser characteristics

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Nebius B.V.