Browser / Kernel Engineer

This is a fully remote position, open to applicants in Lithuania.

📋 Description

• Take charge of the browser stack by maintaining and enhancing our proprietary patched-browser cloud along with its per-OS fingerprint profiles, ensuring they are continuously updated to new stable Chromium versions without compromising evasions.

• Patch the engine by addressing issues in navigator, WebGL, canvas, fonts, and Client Hints at the implementation level, ensuring that spoofed values appear native rather than artificially added.

• Eliminate CDP leaks by identifying and removing signals that reveal automation, all while preserving normal control functionalities.

• Ensure accuracy by aligning geolocation, timezone, and locale to create a cohesive overall experience.

• Investigate detection issues; when something is flagged, analyze the source to understand the cause and implement a fix.

• Develop the necessary tools by creating harnesses that test and validate evasions to catch regressions before they affect customers.

• You define the tasks; we don't assign a ticket queue. You inform us about what is being detected, what is fragile, and what should be prioritized for fixes.

⛳️ Requirements

• Proficient in C++.

• Possess a hacker mindset.

• Knowledge of browser internals.

• Demonstrate persistence.

• Excellent writing skills.

• Ability to work independently.

• Proficient in English, both written and spoken.

• Experience in shipping or contributing to a browser-engine patch, fork, or stealth tool (e.g., Chromium, Firefox, camoufox, or similar).

• Understanding of browser fingerprinting and methods to spoof it at the implementation level.

• Practical knowledge of CDP and both headless and headful automation internals.

• Familiarity with the build infrastructure of Chromium or Firefox and managing large-scale patches.

• Awareness of TLS and HTTP fingerprinting.

• Experience in running browsers at scale.

• Contributions to open-source stealth or browser tooling projects.

🏝️ Benefits

• Fully Remote: Work from any location.

• Equity share: Have a stake in what you're building.

• Profit sharing: Share in the success of the company.

• Accelerated learning: Engage with all aspects of a growing SaaS, take on multiple roles, and deliver real products to actual customers.

• Annual team retreats (the last one was in Spain).