Senior Software Engineer (Agentic Search) - Web Access Engineer

Build the web-access infrastructure for an agentic search engine. Responsibilities: research how modern websites communicate with browsers across the request lifecycle; investigate browser fingerprinting and client verification; build browser instrumentation, debugging, observability, and large-scale experimentation tooling; translate research into production systems at internet scale. Requirements: 5+ years as a software engineer on production backend or infrastructure systems; expertise in browser technologies (Chromium internals, browser lifecycle, CDP), Playwright/Puppeteer/Selenium or similar, web platform protocols (HTTP/1.1/2/3, TLS, DNS), cookies/storage/caching, JavaScript execution, resource loading and browser networking. Nice-to-have: browser engine or infra experience, reverse engineering, distributed systems, Go/C++/Rust/Python, Kubernetes.