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ASSYSTEM

Engineering services for design, construction, commissioning

Fluid Systems/HVAC Engineer

Thermal & Fluids EngineeringConfirmed live in the last 24 hours
Full-timeMontrouge, France€35k - €44k /yrIn-person

About the Job

Requirements

  • A Bac+5 qualification specializing in mechanics, thermics, aerodynamics, or climate engineering is required.
  • At least two years of successful experience in HVAC, in the nuclear industry or a related sector, is required.
  • Knowledge of nuclear engineering is required, particularly pressurized water reactor operation, nuclear facility design principles, and nuclear safety fundamentals.
  • A minimum B2 level of English is required.
  • Strong written communication and interpersonal abilities are required to interact effectively with varied stakeholders.
  • Autonomy, rigor, analytical ability, initiative, and the ability to make constructive proposals are required.

Responsibilities

  • Lead technical studies, monitor costs, and meet deadlines for technically demanding contracts.
  • Understand the operation and sizing of ventilation system equipment.
  • Conduct system operation studies and aerodynamic, hydraulic, and thermal sizing calculations.
  • Write technical specifications for system operation.
  • Manage system-related modifications.
  • Coordinate with the project's commissioning entities.

Desired Qualifications

  • Experience in a demanding or regulated industrial environment is an additional asset.

About the Company

ASSYSTEM

Engineering services for design, construction, commissioning

Assystem provides engineering services for complex projects, covering design, construction, supervision, commissioning, and operation, with a strong focus on the nuclear and energy sectors. Its approach combines multidisciplinary engineering teams and project-management capabilities to move projects from initial concept through to operation. The company differentiates itself through a long track record, strategic acquisitions (including Alphatem in 1995 and Mactech Energy Group in 2025) and an early public offering in 2013, which have expanded its capabilities and market reach in the energy and nuclear fields. Its goal is to be a leading, reliable partner for clients by delivering end-to-end engineering services and helping them meet safety, performance, and regulatory requirements across the project lifecycle.

Company size
5,001-10,000
Company stage
IPO
Headquarters
Paris, France
Founded
1966

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