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 54,000 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. 56,000 employees and annual revenue of c. €7.2 billion (at the go-forward perimeter), 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. Roles & Responsibilities: Lead administration, architecture, and optimization of Google SecOps (Chronicle SIEM & SOAR). • Manage SIEM onboarding, parser development, UDM mapping, correlation rules, dashboards, and automation. • Support migration, integration, and coexistence of SIEM platforms (ArcSight, QRadar, Splunk, Sentinel, LogRhythm, etc.) with Google SecOps. • Design and implement detection use cases aligned with MITRE ATT&CK. • Lead log source onboarding, normalization, troubleshooting, and data quality management. • Develop and optimize YARA-L rules, SOAR playbooks, and threat detection content. • Manage platform health, performance tuning, upgrades, and vendor coordination. • Drive security monitoring, threat hunting, incident response, and root cause analysis activities. • Manage RBAC, IAM integration, access governance, and compliance requirements. • Provide technical leadership and mentoring to SOC analysts and engineers. • Support audit, compliance, reporting, and continuous improvement initiatives. Skills • Google SecOps (Chronicle SIEM & SOAR) • SIEM Architecture & Administration • YARA-L /KQL Rule Development • UDM Mapping & Parsing using Regex • Detection Engineering/Usecase Management • Threat Hunting & Incident Response • Windows and Linux Administration • Azure, AWS, and GCP Security • MITRE ATT&CK Framework • API Integrations & Automation SIEM Knowledge (Mandatory) Experience in one or more of Microsoft Sentinel, ArcSight, Splunk, IBM QRadar, LogRhythm. Preferred Certifications • Google SecOps Certification (Mandatory) • Splunk/Sentinel Certified Admin. 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.