NielsenIQ

consumer intelligence

CyberSecurityEngineer(CTF,ReverseEngineering,Antibot&EthicalHackerexperience)

Barcelona, Spain FULL TIME
The Brief

“Cyber Security Engineer (CTF, Reverse Engineering, Anti-bot & Ethical Hacker experience) at NielsenIQ. Skills: Reverse Engineering, Anti-bot Mechanisms, Custom Tool Development, Stealthy Scraping Techniques, Python Development, Protocol Analysis (TLS, HTTP/2, HTTP/3, WebSockets, DoH). 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”

What You'll Achieve.

Enhance our data extraction methods; Keep our operations discreet; Stay ahead of ever‑evolving defenses

Industry & Context.

consumer intelligence
Problems you'll solve

Pushing systems to their limits; Uncover hidden mechanisms; Identify vulnerabilities; Design and implement robust, efficient solutions for complex challenges; Independent problem-solver

What They're Looking For.

Must Have

Reverse Engineering & Decompilation, Analyze web and mobile applications (APK/IPA), Disassemble code, Focus on cryptographic functions, Evaluate and bypass advanced security protocols such as TLS, HTTP/2, HTTP/3, WebSockets, DoH, and session management, Identify vulnerabilities, Build robust Python scripts and frameworks, Automate bypass procedures, Dynamically adjust security measures, Modify TLS stacks, Patch JavaScript on the fly, Engineer sophisticated methods—such as browser patching, headless browser evasion, proxy tunneling, and human‑behavior emulation, Keep our operations discreet, Regularly test, disrupt, and improve our tools, Stay ahead of ever‑evolving defenses, Pushing systems to their limits, Upholding the highest ethical standards, Reverse Engineering expertise, Dissecting both binary and web code, Uncover core functionalities, Deep expertise in protocols such as TLS, HTTP/2, WebSockets, DoH, Leveraging that knowledge to find innovative solutions, Advanced Python Developer, Design and implement robust, efficient solutions for complex challenges, Independent problem-solver, Collaborative Innovator

Nice to Have

CTF experience, Anti-bot experience, Ethical Hacker experience, IDA Pro, Ghidra, Custom-built solutions

What You'll Do.

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

Evaluate and bypass advanced security protocols such as TLS

and session management

Identify vulnerabilities to enhance our data extraction methods

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

Engineer sophisticated methods—such as browser patching

headless browser evasion

and human‑behavior emulation—to keep our operations discreet

and improve our tools to stay ahead of ever‑evolving defenses

How You'll Work.

Team & Collaboration

Collaborative Innovator; Thrive in a dynamic team environment that values open communication and continuous learning

Communication Scope

Open communication

Free ATS check

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