Backend Infrastructure Engineer, Anti-Bot

ABOUT THE ROLE Join the infrastructure team at a growing AI-focused web data extraction company. You will build and operate the systems that help high-volume extraction remain reliable against websites that actively resist automated access. WHAT YOU'LL DO - Architect and manage proxy rotation, IP and session management, and isolated egress nodes at scale. - Improve extraction success against anti-bot and anti-scraping defenses. - Build and maintain browser and TLS fingerprinting, CAPTCHA, and challenge-handling infrastructure. - Monitor the reliability and cost efficiency of the proxy layer. - Investigate intermittent failures across the stack, resolve root causes, and maintain production systems. WHAT WE'RE LOOKING FOR - More than 3 years of experience in adversarial web infrastructure or proxy-layer engineering, with recent hands-on work in web extraction against active defenses. - Production experience designing proxy rotation, IP and session management, egress isolation, and proxy economics for third-party web extraction. - Experience bypassing major anti-bot systems in production and owning associated success-rate metrics. - Hands-on experience with browser and TLS fingerprinting and CAPTCHA or challenge handling at production scale. - Proficiency in Go and/or Python, plus networking fundamentals including TCP/IP, HTTP/2, connection pooling, and proxy orchestration. - Experience owning end-to-end production systems, including on-call responsibilities and observability tools such as Prometheus and Grafana. - Comfort working in complex, adversarial problem spaces and shipping, measuring, and iterating quickly. COMPENSATION & BENEFITS Base salary: $235,000 to $260,000 annually. Visa sponsorship is available. LOCATION Hybrid in San Francisco, California.