Junior Penetration Tester - Apprenticeship (f/m/d)

THE SECURITY UNITED

At Decathlon Digital, we are powering the future of connected sport by designing the world’s largest digital sports platform. Driven by our tech teams based in Lille, Paris, and internationally, we leverage cutting-edge technological innovations to optimize our entire value chain, create unique immersive experiences, and accelerate the circular economy. Our ambition? To combine technological performance, accessibility, and social responsibility to make sport sustainably accessible to as many people as possible. Joining Decathlon Digital means becoming part of an agile, collaborative, and forward-thinking environment, where every line of code and every security building block contributes to a positive global impact through our Tech4Good approach.

JOIN THE CYBER DEFENSE TEAM You will join a team of cybersecurity enthusiasts who safeguard our global ecosystem daily. By combining offensive (Red Team) and defensive (Blue Team) visions, our experts simulate cyberattacks, hunt for vulnerabilities, and design the most advanced detection rules to secure Decathlon.

In the framework of an open work-study position, we are recruiting a Junior Cybersecurity Engineer (Apprenticeship) , based in Lille.

YOUR MISSIONS

• You will contribute to evaluating our security posture by mapping existing detection rules onto the MITRE ATT&CK framework to identify and bridge defensive blind spots.
• You will participate in attack simulations using frameworks like Atomic Red Team to validate proper alert generation within the EDR and SIEM.
• You will participate in post-Pentest follow-ups by managing the vulnerability lifecycle through to final remediation and transformation into concrete defensive rules.
• You will contribute to developing, customizing, and obfuscating offensive tools (Red Team Tooling) by experimenting with the use of Generative AI.
• You will participate in creating and updating our technical Playbooks to enrich the team's knowledge base, while shadowing senior analysts during complex penetration tests.

YOUR TECHNICAL ENVIRONMENT

• Cyber Frameworks & Concepts: MITRE ATT&CK, OWASP Top 10, Atomic Red Team, EDR, SIEM.
• Scripting & Automation: Python, PowerShell, Bash.
• Methodologies & Tools: AI / LLM (Prompt Engineering), Windows/Linux environments and Active Directory, Cloud basics (GCP/AWS) & Containerization.

WHAT YOU NEED TO SUCCEED

• A significant first experience (university projects, internship, work-study) or regular practice in labs/CTFs (TryHackMe, Root-Me, HackTheBox) within the cybersecurity field.
• Pursuing a Master 1 or Master 2 degree minimum, specializing in Cybersecurity.
• A strong understanding of classic attack mechanisms, solid foundations in system/network administration, and proficiency in using Generative AI for coding tasks.
• An excellent "out-of-the-box" analytical mindset and the ability to communicate fluently in both French and English.
• A strong appetite for teamwork and a culture of knowledge sharing.
• An interest in the impact of sport on personal and collective development.
• The desire to join a company committed to Tech4Good and responsible innovation.

WHY JOIN US?

At Decathlon, we make it a point of honor to offer a fulfilling and motivating work environment. A stimulating work environment: Great Place to Work and Happy Trainees certified company. Attractive benefits (after 3 months of seniority):

• Monthly bonuses, profit-sharing, employee stock ownership
• Works council (CSE) benefits
• 25% discount on our products
• Coverage of your CVEC student tax
• 50% reimbursement of your transport subscription & urban mobility allowance

Tailor-made support: coaching, internal and external training, knowledge sharing. ⚡ A culture of sport and product testing: become an ambassador for our innovations and join our internal sports teams!

FAQ – ALL YOUR QUESTIONS

How should I prepare my application and how does the recruitment process work? 1️⃣ Read the job description carefully and highlight your most relevant experiences and skills. 2️⃣ Personalize your CV to stand out. 3️⃣ After applying, you will receive an answer within two weeks. If you are shortlisted, you will go through at least two interviews with your future leader and a technical peer.

I am not familiar with the sports industry, do I still have a place at Decathlon? Of course! We are primarily looking for passionate and motivated people, whether in their field of expertise or for sport in general.

What is it like to be a student at Decathlon? It is much more than a simple work-study program or internship! It is about shaping your professional future by contributing to concrete projects that make sense to you, while being guided and supported at every stage.

Our ambition? To offer you an enriching experience to prepare you for your future career and, why not, welcome you on a permanent contract (CDI) at the end of your program. In fact, more than 50% of our students permanently join the Decathlon adventure!

DECATHLON DIGITAL 

Imaginez si la technologie nous permettait de repousser les frontières et d'offrir des expériences sportives inédites. C'est précisément notre ambition chez Decathlon Digital ! Nous sommes une équipe de plus de 5 000 experts en ingénierie logicielle, gestion de produits, données, cloud et cybersécurité, répartis à Paris, Lille et Amsterdam. Ensemble, nous créons la plus vaste plateforme sportive numérique, en exploitant les innovations technologiques pour optimiser la chaîne de valeur, concevoir des expériences connectées et donner une seconde vie à nos produits.

Changeons la donne pour de bon. Notre passion du sport nous guide et nous voulons qu’elle perdure. C’est pourquoi nous nous engageons à bâtir un modèle technologique plus durable, en réduisant notre impact direct sur l'environnement, et en créant un espace sûr et inclusif pour apprendre et nous épanouir ensemble. Rejoins l’équipe et façonnons le futur du sport.