Senior Red Team Pentester

Atos is the Atos Group brand dedicated to AI-powered, secure, end-to-end digital services. Atos designs, develops, and operates critical digital environments that drive performance, resilience and sovereignty, helping public and private organizations worldwide retain control over their data and infrastructures, while meeting regulatory requirements. With more than 52,000 employees serving over 4,500 clients across 54 countries, Atos helps modernize core IT systems, accelerate cloud and data transformation, strengthen cybersecurity, and deliver secure digital workplace environments to support its clients, its employees and society. Atos also provides consulting and advisory services through its Atos Amplify brand. A trusted partner in operating complex and mission-critical environments, Atos supports organizations across highly regulated and sovereign contexts. About Atos Group Atos Group is a global leader in digital transformation with c. 54,000 employees and annual revenue of c. €7.2 billion, operating in 54 countries under two brands - Atos for services and Eviden for products and systems. European number one in cybersecurity and a leader in cloud, Atos Group is committed to a secure and decarbonized future and provides tailored AI-powered, end-to-end solutions for all industries. Atos Group is listed on Euronext Paris. We are looking for a senior, hands-on offensive security professional who can independently lead complex Red Team, Purple Team and advanced penetration testing engagements across enterprise environments. The role combines deep technical execution with customer-facing leadership, clear reporting and support for developing other security professionals. Key responsibilities Plan and lead Red Team, adversary simulation and advanced penetration testing engagements. Execute realistic attack scenarios across applications, APIs, infrastructure, identity, endpoints and cloud environments. Conduct reconnaissance, initial access, privilege escalation, lateral movement, persistence and post-exploitation activities within approved scopes. Translate technical findings into clear business risk, evidence-based reports and practical remediation recommendations. Map attack paths and techniques to relevant frameworks such as MITRE ATT&CK. Collaborate with defensive security teams during Purple Team exercises and support improvements to detection and response capabilities. Provide technical leadership, customer-facing guidance and mentoring to less experienced team members. Follow legal, ethical and engagement-specific rules of operation at all times. Required experience and skills Extensive hands-on experience in Red Teaming and advanced penetration testing. Strong understanding of enterprise identity, Active Directory, Windows and Linux environments, networking and common cloud platforms. Demonstrated expertise in attack-path analysis, privilege escalation, lateral movement and post-exploitation. Strong scripting or programming capability for automation, tooling and payload development. Ability to lead engagements independently and communicate effectively with both technical and non-technical stakeholders. Strong technical reporting skills and a consistent focus on evidence, risk and remediation. Preferred qualifications Experience with Purple Teaming, detection engineering, threat hunting or incident response. Relevant advanced offensive security certifications, or equivalent demonstrable expertise. Experience working in complex, regulated or multinational enterprise environments. Experience mentoring security engineers and contributing to team capability development. Rewards and benefits: Opportunity to work on long-term, complex enterprise projects. Exposure to modern technologies and containerized platforms. Continuous learning and professional development opportunities. Career growth within a stable and collaborative environment. Wellbeing programs & work-life balance initiatives. Benefits platform – culture, shopping, sport and more. Continuous learning programs and online courses. Possibility to participate in charity and eco initiatives. 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.