Cybersecurity Engineer (Reverse & Antibot Engineering and CTF/Ethical Hacking)

NielsenIQ
📍 Madrid, Community of Madrid, Spain 💼 full-time 🕒 Posted February 24, 2026

Job Description

Job Description

What You’ll Do 

  • Reverse Engineering & Decompilation: 

    Analyze web and mobile applications (APK/IPA) to uncover hidden mechanisms. Disassemble code to understand its inner workings, with a focus on cryptographic functions that secure our systems. 

  • Overcoming Anti‑Bot Mechanisms: 

    Evaluate and bypass advanced security protocols such as TLS, HTTP/2, HTTP/3, WebSockets, DoH, and session management. Identify vulnerabilities to enhance our data extraction methods. 

  • Developing Custom Tools: 

    Build robust Python scripts and frameworks that automate bypass procedures and dynamically adjust security measures—whether by modifying TLS stacks or patching JavaScript on the fly. 

  • Implementing Stealthy Scraping Techniques: 

    Engineer sophisticated methods—such as browser patching, headless browser evasion, proxy tunneli...

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Job Details

  • Location Madrid, Community of Madrid
  • Job Type full-time
  • Category Computer Occupations
  • Posted Date February 24, 2026
  • Application Deadline April 05, 2026