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ASSYSTEM

Engineering services for design, construction, commissioning

Expert HVAC H/F

HVAC & Building SystemsConfirmed live in the last 24 hours
Full-timeÎle-de-France, France€49k - €78k /yr

About the Job

Requirements

  • A degree from an engineering school or university training specialized in thermal, energy, HVAC/climate, or aerodynamics fields.
  • Significant experience in HVAC/HVAC engineering, ideally in a nuclear or demanding industrial environment.
  • Mastery of nuclear confinement and ventilation principles, including pressure cascades, dynamic confinement, HEPA filtration, contamination management, nuclear safety, and radiation protection.
  • Proven experience designing and sizing HVAC systems from preliminary design through detailed studies.
  • Ability to analyze 3D integration, constructability, and on-site installation issues.
  • Professional English at a minimum B2 level is desirable for successful performance in the role.

Responsibilities

  • Define the architecture of HVAC and nuclear ventilation systems in line with safety, operational, maintenance, and radiation-protection requirements.
  • Lead HVAC design studies, including thermal balances and sizing of air, hydraulic, and refrigeration networks and equipment.
  • Define nuclear ventilation principles, including pressure cascades, dynamic confinement, filtration, air renewal, management of radiological risk zones, and contamination control.
  • Verify the compliance of technical choices with applicable regulatory requirements and nuclear standards.
  • Participate in producing and validating principle diagrams, piping and instrumentation diagrams, functional diagrams, and system design notes.
  • Verify HVAC installation integration in 3D models and ensure constructability, operability, and maintainability.
  • Provide expertise on installation issues, including network routing, multidisciplinary interfaces, supports, maintenance access, and assembly sequences.
  • Conduct technical reviews of supplier studies and critically assess proposed solutions.
  • Define or supervise test programs, participate in functional qualification activities, and contribute to commissioning HVAC and nuclear ventilation installations.
  • Support teams in resolving discrepancies encountered during design, installation, testing, or start-up phases.
  • Ensure lessons learned are captured and contribute to continuous improvement of HVAC methods and standards.

Desired Qualifications

  • Experience in a nuclear or demanding industrial environment.
  • Experience with functional testing, qualification, and commissioning of nuclear installations.
  • Experience using thermal calculation and simulation tools such as ThBat, MacroBat, or equivalent tools.
  • Experience using HVAC calculation tools and 3D model review tools such as PDMS, E3D, Navisworks, or equivalent tools.
  • Professional English at B2 level or higher.

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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