Assystem SA (Assystem) provides engineering, project management, advisory, and digital solutions for complex and critical infrastructure. Its services span the preparation, design, construction, operation, maintenance, life extension, and end-of-life management of infrastructure. In the nuclear sector, Assystem provides owner engineering services across the nuclear cycle, including advisory services, project management, technical studies, site characterization, environmental and electricity-grid impact assessments, technology selection, licensing and safety assessments, building-permit support, design review, construction quality controls, commissioning controls, and operating and maintenance procedures. The company also undertakes decommissioning and radioactive-waste processing, treatment, and storage assignments.

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Assystem’s research and development activity focuses on applying digital technologies to nuclear and other complex-infrastructure projects. Its annually updated innovation and digital roadmap combines nuclear engineering, systems engineering, data management, and project controls. The R&D portfolio covers digital twins, data engineering, artificial intelligence (AI), generative AI, and spatial computing for industrial use cases. In FY2025, the company advanced complex-system modelling to structure lifecycle data, manage configuration, and improve traceability. It also expanded use of connected product lifecycle management, building information modelling, enterprise asset management, and data platforms, favoring configured third-party systems over bespoke development. Assystem established a Group-wide AI initiative to scale use cases, share practices, and apply agentic engineering to its industrial knowledge base. It also launched the Assystem Transformation Program, including a new enterprise resource planning system and digitalization of human-resources and finance processes. The company works with engineering-platform, digital-twin, and cloud providers, and collaborates with start-ups, universities, research centers, and industrial partners.