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Who we are.
We are a team of passionate experts with a clear ambition: applying digital technology toadvance what mattersfor our clients and society.
Together we createreliable and responsive digital foundationsfor the world’s businesses, institutions, and communities.
Learn more on Advancing what matters

About Atos

Atos is a global leader in digital transformation with c. 78,000 employees and annual revenue of c. € 10 billion. European number one in cybersecurity, cloud and high-performance computing, the Group provides tailored end-to-end solutions for all industries in 68 countries. A pioneer in decarbonization services and products, Atos is committed to a secure and decarbonized digital for its clients. Atos is a SE (Societas Europaea) and listed on Euronext Paris.

The purpose of Atos is to help design the future of the information space. Its expertise and services support the development of knowledge, education and research in a multicultural approach and contribute to the development of scientific and technological excellence. Across the world, the Group enables its customers and employees, and members of societies at large to live, work and develop sustainably, in a safe and secure information space.

Role Overview:

We are seeking a highly skilled and passionate Senior Security Engineer to join our Red Team. This role is ideal for someone with a strong offensive security mindset, hands-on experience in penetration testing, system administration, and software development. You will simulate real-world attacks to identify vulnerabilities, improve detection and response capabilities, and contribute to the overall security posture of the organization.

Key Responsibilities:

• Plan and execute advanced red team operations, including adversary emulation and scenario-based testing.
• Develop and maintain custom tooling for offensive security operations.
• Perform vulnerability assessments, exploit development, and post-exploitation activities across diverse environments.
• Conduct reconnaissance, initial access, lateral movement, and persistence techniques using C2 frameworks.
• Analyze and reverse engineer applications, binaries, and protocols.
• Collaborate with blue teams to improve detection and response capabilities.
• Research and publish technical blog articles, CVEs, and open-source tools.
• Participate in CTFs, bug bounty programs, and contribute to the security community.
• Share knowledge across teams and mentor junior engineers.

Required Skills & Experience:

• Penetration testing and red teaming experience.
• Solid background in system administration and software development.
• Deep understanding of vulnerabilities and exploitation techniques.
• Proficiency in at least one programming language (e.g., Python, C/C++, Go).

Experience with:

• BurpSuite, Nmap, Nessus, and other scanning tools
• Cloud environments (AWS, Azure, GCP)
• Active Directory and EntraID
• Familiarity with networking fundamentals and operating systems (Windows, Linux)
• Strong communication and documentation skills.

Preferred Qualifications (Nice-to-Have):

• Experience in incident response and threat hunting.
• Certifications such as OSCP, CRTO, CRTL, OSEP, OSWE, OSED, CPSTS, CAPE, CWEE, CISSP.
• Contributions to CVEs or security research.

What We Offer:

• Work in a dynamic, international environment.
• Opportunities for professional growth and involvement in strategic projects.
• Competitive salary and benefits package.

Here at Atos, diversity and inclusion are embedded in our DNA. Read more about our commitment to a fair work environment for all.

Atos is a recognized leader in its industry across Environment, Social and Governance (ESG) criteria. Find out more on our CSR commitment.

Choose your future. Choose Atos.

Learn more about us
At Atos, we embrace diversity as the ultimate engine of ingenuity for our clients, and we constantly strive to create a culture where people feel supported and encouraged. Read more about our commitment here .

Whether it is fighting climate change, promoting digital inclusion, or ensuring trust in data management – tech for good sits at the core of our identity. With numerous global recognitions for our ESG practices, we are committed to building a better future for all by harnessing the power of technology. Learn more here

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