Assystem S.A. provides engineering and infrastructure project management services in France, Rest of Europe, Asia, the Middle East, and Africa. The company offers engineering services for the preparation, design, and construction of critical and complex infrastructure projects for public authorities and utility companies. It also provides engineering, procurement, and construction management; project management consulting; field operation management; siting, licensing, and environmental; systems engineering and design; industrial control system; and compliance, risk monitoring, safety, and security services, as well as digital transformation consulting, integrating business information system, data as a source of value, and digital twin services for nuclear, hydrogen, renewable, grids, transportation, cities and territorial development, and defense and security infrastructure sectors. In addition, the company offers decommissioning and waste management services, and operation and maintenance services. The company was formerly known as AssystemBrime S.A. and changed its name to Assystem S.A. in June 2005. Assystem S.A. was founded in 1966 and is based in Courbevoie, France. Assystem S.A. is a subsidiary of HDL Development.