Web Security Researcher

A premier, high-growth Israeli AI & Web Intelligence scale-up engineering a cutting-edge real-time web data extraction, search, and synthesis platform powered by autonomous AI Search Agents.

Backed by a massive Series B funding round from elite global venture capital funds, the company serves over 120 enterprise customers worldwide.

The company provides an elite R&D environment tackling deep-web challenges, advanced anti-bot mitigations, and complex browser engine internals at global internet scale.

Located in central Tel Aviv (walking distance from the train station), operating on a hybrid work model.

Role Description-

• Serving as a Senior Security Researcher & Browser Reverse Engineer (Web Data & Anti-Bot), spearheading deep technical research and reverse engineering of modern web architectures, anti-bot mechanisms, and browser internals.

• Dissecting and analyzing complex JavaScript engines, Web APIs, and Browser Internals across Chromium and Firefox codebases.

• Reverse-engineering advanced bot detection, fingerprinting, and behavioral challenge mechanisms (CAPTCHAs, WAFs, TLS/JA3/JA4 fingerprinting, JS obfuscation).

• Designing, developing, and deploying resilient bypasses and data extraction techniques in close collaboration with Core R&D, AI Research, and Platform engineering squads.

• Pushing the technical boundaries of large-scale automated web navigation, headless browser orchestration, and autonomous agentic web workflows.

Requirements-

• 5 years of proven hands-on experience in Security Research / R&D Teams, with deep specialization in at least one of the following:

• Web Data Extraction & Web Scraping at Scale

• Software / Web Reverse Engineering

• Browser Technologies & Engine Internals (Chromium / Firefox / WebKit) – Mandatory

• Deep, advanced mastery of JavaScript (Node.js & Browser JS), including hands-on experience reverse-engineering heavily obfuscated web scripts – Mandatory

• Strong technical background in Network Protocols, HTTP/HTTPS, WebSockets, TLS/SSL Fingerprinting, and DOM manipulation – Mandatory

• Exceptional analytical capabilities, creative problem-solving skills, and meticulous attention to detail – Mandatory

• Experience with browser automation frameworks (Playwright, Puppeteer, Selenium, or custom CDP implementations) – Significant Advantage

• Background in Cybersecurity, Vulnerability Research, Malware Analysis, or Anti-Bot / Fraud Detection engineering – Significant Advantage

• Proficiency in additional systems/scripting languages (Python, C++, or Go) – Advantage