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Penetration Tester / Security Engineer (m/f)

Hybrid

ARHS GroupLuxembourgPosted on 2 octobre 2026IT services company · freelance status to confirmView the original ad on the company's website

≈ 550 – 850 €/jSign up to apply

About this mission

ARHS Group, part of Accenture, is looking for a Penetration Tester / Security Engineer (m/f) to join our Security Team in Luxembourg.

If you enjoy identifying vulnerabilities, assessing application and infrastructure security, and staying up to date with the latest attack techniques, we'd be happy to meet you. You'll work on a variety of security projects while collaborating with experienced security professionals in an international environment.

Responsibilities

  • Perform automated and manual penetration testing of web and mobile applications, as well as cloud and on-premises infrastructures.
  • Contribute to the continuous improvement of secure software development practices and promote security throughout the development lifecycle.
  • Identify security weaknesses and propose mitigation strategies or secure architectural improvements.
  • Analyze customer security requirements and recommend appropriate technical solutions.
  • Evaluate and improve penetration testing methodologies and security processes.
  • Prepare clear and concise technical reports with findings and recommendations.
  • Collaborate with developers and security engineers to improve the overall security posture of applications and infrastructures.
  • Share knowledge, contribute to team learning, and drive continuous improvement initiatives.

Our roles require in-person time to encourage collaboration, learning, and relationship-building with colleagues and communities. As an employer, we will be as flexible as possible to support your specific work/life needs.

Required profile

  • Master's degree in Computer Science, Information Security, or a related field is preferred.
  • Minimum 2 years of experience in penetration testing or application security.
  • Experience performing internal penetration tests and/or participating in Red Team exercises.
  • Good knowledge of penetration testing tools such as Burp Suite Professional, Nmap, Metasploit, Nessus, and Kali Linux.
  • Good understanding of:
    • OWASP Top 10
    • MITRE ATT&CK
    • DevSecOps and Secure SDLC principles
    • OSI/TCP networking concepts
    • Cloud security principles (AWS/Azure)
  • Familiarity with one or more programming or scripting languages such as Java, C/C++, PHP, or Python.
  • Strong analytical, problem-solving, and communication skills.
  • Curiosity, creativity, and willingness to continuously learn new technologies and attack techniques.
  • Experience working in Agile environments.
  • Fluency in English (written and spoken).

BONUS POINTS IF YOU HAVE:

  • Experience developing custom exploits or participating in bug bounty platforms such as HackerOne, Hack The Box, or TryHackMe.
  • Previous experience as a software developer.
  • One or more of the following certifications:
    • OSCP
    • OSWE
    • eCPPTv2
    • CHFI
    • GIAC GPEN
    • AWS Certified Security – Specialty
    • Azure Security Engineer Associate

Key information

LocationLuxembourg
RemoteHybrid
Estimated daily rate≈ 550 – 850 €/j

Range estimated by our AI from the ad and the freelance rates published in Luxembourg: the company did not publish a rate. To be confirmed when you talk. This IT services company did not state the status; such companies usually accept freelancers. Apply in 1 click and we check with them.

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