Work on Firefox's security architecture and cryptography stack, including cryptographic protocols, WebPKI, and security-sensitive web APIs. Design and implement web platform security features, improve browser reliability/performance in a multi-threaded native codebase, collaborate across teams on security initiatives, and contribute to technical design and standards-based implementations. Requires strong C/C++ skills, security fundamentals, debugging and systems programming experience; Rust familiarity is a plus.

SearchApi seeks an experienced engineer to own the browser stack: patch browser engines (Chromium/Firefox) in C++, maintain per-OS fingerprint profiles, eliminate automation-detection signals (navigator, WebGL, canvas, audio, fonts, Client Hints, CDP leaks), and build tooling and tests to prevent regressions. The role requires deep reverse-engineering skills, familiarity with large browser build systems, and proven contributions to browser-engine patches or stealth tooling.

Join DuckDuckGo's Privacy Functional Team to lead and own major components of privacy technology, design systems to protect user privacy, build features for Tracker Radar, and participate in privacy reviews and audits. Role is remote (many listed countries), includes mentoring responsibilities, requires occasional travel (~2 times/year), and offers $178,500 USD annual compensation plus stock options.

SearchApi seeks a remote Anti-Bot Engineer to research and implement anti-bot evasion, reverse engineer detection systems (Cloudflare, Akamai, DataDome, PerimeterX, etc.), optimize Playwright/Puppeteer/CDP configurations, debug TLS/protocol fingerprinting (JA3/JA4, HTTP/2, HTTP/3/QUIC), analyze network traffic, and run headless browsers reliably at scale. Fluent English and deep hands-on experience with browser internals, fingerprinting, network analysis tools, and relevant tooling (Playwright, Puppeteer, Selenium, Wireshark, Burp Suite, mitmproxy) are required.