Senior Reverse Engineer

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

📋 Description

• Engage in reverse-engineering some of the most complex antibot and fingerprinting systems present on the web, including JS VMs, WASM, and polymorphic/obfuscated code.

• Develop JS function tracing, deobfuscation pipelines, and fingerprint-inspection tools that transform manual reverse-engineering efforts into efficient, repeatable, and largely automated workflows.

• Leverage AI technologies extensively — including LLMs, agents, and custom automation — to deobfuscate, classify, and diagnose detection surfaces, while rapidly prototyping and deploying tools that would typically require weeks to create.

• Construct and sustain website intelligence pipelines with checkpointed history, allowing us to compare against a known-good baseline when an antibot update is released, rather than starting from scratch.

• Provide our AI reverse-engineering and ban-resolution systems with the context, signals, and structured intelligence essential for autonomously resolving the majority of cases.

• Transform individual reverse-engineering successes into sustainable capabilities — including tools, rules, and pipelines that can be utilized by other engineers and AI agents.

• Collaborate across engineering teams to integrate your tools into the custom browser and automation stack, while mentoring others in AI-enhanced reverse-engineering techniques.

⛳️ Requirements

• Possess a hacker mindset — capable of quickly developing proof-of-concepts and functional tools to achieve results, while being comfortable with the uncertainties and open-ended nature of the work.

• Proven experience utilizing AI tools (LLMs, coding agents, automation) to enhance your engineering processes, with a keen intuition for what to automate and when.

• Strong expertise in JavaScript/Node.js and Python, complemented by a diverse programming background and remarkable problem-solving skills.

• Excellent research, debugging, fuzzing, and reverse-engineering capabilities, including static, dynamic, and concolic analysis.

• Practical experience reversing JavaScript VMs, WASM, and extensively obfuscated or polymorphic code.

• A thorough understanding of operating systems and computer networking principles.

• Proficient with tools like Wireshark, Burp Suite, and similar applications for intercepting and debugging network traffic.

• Familiarity with browser engines, browser fingerprinting techniques, and antibot/anti-scraping strategies.

• Approach prioritization in a logical manner, backed by measurable strategies, and excel in a collaborative setting.

• Bonus points for:

• Experience with reverse-engineering tools such as IDA, Ghidra, Frida, or Babel.

• Experience in developing tools or pipelines that support machine-learning or AI systems.

• Background in C/C++ and Rust.

• Significant contributions to Mozilla or Chromium projects.

🏝️ Benefits

• Join a self-motivated, progressive, and diverse team.

• Enjoy the freedom and flexibility to work from the location that best suits your productivity.

• Attend conferences and connect with team members from around the world.

• Work with state-of-the-art open-source technologies and tools.