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Senior Cyber Security Engineer (Reversing, Ethical Hacking, CTF & Antibot Engineering)

NielsenIQ

Barcelona, Catalonia, Spain Full-time June 05, 2026
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Opportunity Description

Company Description

At Digital Shelf by NIQ, we’re passionate about technological innovation and excellence in cybersecurity. Our cutting-edge solutions enable us to scrape data for 12 billion products and manage over 20 billion data points. In a market where anti‑bot technologies represent a $10B industry in constant evolution and consolidation, our dedicated teams tackle real‑world challenges with precision and creativity.

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. 

    Full-time Computer Occupations
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