Senior Penetration Tester/Red Team Operator

• 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.

This is a hybrid role (PT/RT) for someone who thinks like an adversary, learns and follows real-world threat actors, and cares about the quality and relevance of every engagement they touch.

• You will lead and execute technical security assessments across a broad range of environments and dedicate a meaningful portion of your time to Research & Development (R&D) , developing new tooling, novel attack techniques, and advancing your own areas of deep expertise.
• This is not a checkbox testing role. Our clients engage us because they want to understand how a real attacker would operate against them. Your job is to make that simulation credible, contextual, and genuinely useful to defenders.

Job Description

After an initial onboarding into NTT Data methodologies and client environments, you will be expected to:

Lead and execute technical engagements, including scoping, technical security testing, analysis, reporting, and client presentations, across:

Web, Mobile, and Desktop Applications Penetration Tests

IT Infrastructure and Network environments Penetration Tests

Active Directory and hybrid identity (AD / Entra ID) Penetration Tests

Cloud platforms (Azure, AWS, GCP, M365) Penetration Tests

Full-spectrum Red Team and Adversary Simulation operations

Design and deliver adversary simulation, including:

Developing realistic, intelligence-led attack scenarios grounded in actual threat actor TTPs

Crafting phishing and social engineering campaigns

Bypassing modern defensive controls (EDR/XDR, MFA) using low-noise techniques

Developing or adapting custom tooling for delivery, evasion, and C2

Supporting Purple Team exercises to directly improve client detection and response capabilities

Drive Research & Development, including:

Becoming a recognised expert in one or more domains of your choosing (Active Directory, cloud-native environments, web browsers, OT/ICS, containers, hardware, etc.)

Researching and responsibly disclosing previously undiscovered vulnerabilities (0-days)

Publishing research through blog posts, whitepapers, CVEs, or conference talks

Developing novel attack techniques applicable to real-world Red Team engagements

Contribute to the business and the team, including:

Supporting pre-sales by capturing client needs and translating them into commercial proposals

Mentoring and guiding junior consultants through projects and skill development

Maintaining a broad, up-to-date knowledge base across core information security domains

Communicating complex attacker behaviour clearly and accurately to both technical and non-technical stakeholders

Here’s what we are looking for in candidates

Must have:

4-5 years of proven experience in Penetration Testing/Red Team Operations.

Proven experience leading or delivering Red Team and/or adversary simulation engagements in complex enterprise environments

Deep understanding of Active Directory, hybrid identity, and cloud attack surfaces

Hands-on experience developing or adapting TTPs beyond what standard frameworks provide out of the box

Demonstrated ability to research abuse paths, misconfigurations, or novel vulnerabilities

Strong written and verbal communication skills, this means you can write a compelling attack narrative and present findings to a CISO without losing either audience (technical or non-technical)

Comfortable acting as a trusted technical advisor to clients and stakeholders

Strong teamwork abilities

Native proficiency in French or Dutch, with excellent verbal and written knowledge of English

Nice to have:

Experience emulating specific real-world threat actors (APT groups, ransomware operators)

Hands-on vulnerability research or PoC development leading to CVEs or public disclosure

Contributions to open-source tooling, public research, or conference presentations (DEF CON, Black Hat, BruCon, ...)

Familiarity with regulated-sector testing frameworks (TIBER-EU, DORA, CBEST, GBEST)

Relevant certifications (CRTO, CRTE, OSED, OSEP, CCRTS or equivalent), very valued but not a prerequisite

Who You Are:

Naturally curious, you read threat intel reports for fun and follow OffSec research because you want to

Motivated by real-world impact, not engagement count

Comfortable with ambiguity and complex environments

A low-ego collaborator who challenges ideas constructively

Committed to continuous learning and raising the bar for those around you

Flexible and you have a willingness to travel for limited periods if required

In possession of a valid driving license (category B) is required

You are eligible and prepared to obtain NATO security 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 your NTT laptop

Workplace type :

• About NTT DATA
• NTT DATA is a $30+ billion business and technology services leader, serving 75% of the Fortune

Global 100. We are committed to accelerating client success and positively impacting society through

responsible innovation. We are one of the world’s leading AI and digital infrastructure providers, with

unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers and

application services. Our consulting and industry solutions help organizations and society move

confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more

than 70 countries. We also offer clients access to a robust ecosystem of innovation centers as well as

established and start-up partners. NTT DATA is part of NTT Group, which invests over $3 billion each

year in R&D.

• Equal Opportunity Employer
• NTT DATA is proud to be an Equal Opportunity Employer with a global culture that embraces diversity. We are committed to providing an environment free of unfair discrimination and harassment. We do not discriminate based on age, race, colour, gender, sexual orientation, religion, nationality, disability, pregnancy, marital status, veteran status, or any other protected category. Join our growing global team and accelerate your career with us. Apply today.

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