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NTT DATA Logo NTT DATA · IT - Software Development

Senior Penetration Tester/Red Team Operator

Belgium, Diegem · Job Posted May 14, 2026
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Job Description

Make an impact with NTT DATA. Join a company that is pushing the boundaries of what is possible. We are renowned for our technical excellence and leading innovations, and for making a difference to our clients and society. Our workplace embraces diversity and inclusion – it’s a place where you can grow, belong and thrive. As our Technology Consulting Services department continues to expand, we are seeking a Senior Penetration Tester/Red Team Operator to join our team. As a Senior Penetration Tester, your primary responsibility will be to lead and perform ethical hacking assessments, custom penetration testing scenarios, …. A significant portion of your time will be dedicated to Research and Development (R&D) and developing your skills where you will be encouraged to develop new tooling, techniques and perform vulnerability research.

Job Responsibility

  • Conduct technical exercises including projects initiation, technical security testing and analysis, reporting and result presentations for clients on topics such as Web Application, Mobile Application, Desktop Application, IT Infrastructure, Red-Teaming
  • Maintain a broad-based technical knowledge in key information security areas
  • Perform technical research: become an expert in one or several topics of interest (Active Directory, Containers, Web Browsers, OT, IoT, ...)
  • Discover new vulnerabilities (0days) and publish research
  • Develop novel attack techniques useful in Red-Teaming engagements
  • Participate in client needs capture and translation into commercial proposal
  • Manage and guide junior colleagues in their projects
  • Effectively translate complex technical information to both technical and non-technical stakeholders

Requirements

  • A minimum of a Bachelor's degree in ICT or equivalent experience
  • Certifications such as OSCP, CRTO, OSEP, OSED, OSWE, ... are highly desirable
  • 4-5 years of experience in penetration testing/offensive security
  • Native proficiency in French or Dutch, with excellent verbal and written knowledge of English
  • Strong personal initiative and a commitment to expanding your technical knowledge
  • Flexibility and willingness to travel for limited periods if required
  • Strong teamwork abilities
  • Creative thinking skills in complex situations (e.g., attempting to bypass security controls)
  • Effective communication skills with clients
  • Excellent proficiency with scripting languages such as Python, PowerShell, Bash, etc.
  • Advanced experience with common penetration testing frameworks and tools
  • Possession of a valid driving license (category B) is required
  • Eligibility and preparedness to obtain NATO clearance

What we offer

  • Contract of unlimited duration
  • Annual bonus
  • Lunch vouchers
  • Forfaitary compensation for professional costs
  • Company car or Mobility budget
  • Hospitalisation insurance and ambulant care at premium level
  • Group and disability insurance
  • Possibility to order a lease bike
  • 31 days of holiday plus seniority days
  • Data and voice subscription + contribution for a smartphone device
  • Contribution for internet at home
  • Contribution for IT equipment
  • Private use of NTT laptop
  • Hybrid Working
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