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ASSYSTEM

Engineering services for design, construction, commissioning

HVAC Expert

Building Services EngineeringConfirmed live in the last 24 hours
Full-timeMarseille, France€49k - €78k /yr

About the Job

Requirements

  • Graduation from an engineering school or university program specialized in thermal, energy, climate, or aerodynamics disciplines.
  • Significant experience in HVAC or heating, ventilation, and air-conditioning engineering, ideally in a nuclear or demanding industrial environment.
  • Knowledge of nuclear containment and ventilation principles, including pressure cascades, dynamic containment, HEPA filtration, contamination management, nuclear safety, and radiation protection.
  • Proficiency with thermal calculation and simulation tools such as ThBat, MacroBat, or equivalent tools.
  • Proven experience designing and sizing HVAC systems from preliminary design through detailed studies.
  • Ability to analyze 3D integration, constructability, and on-site installation issues.
  • Proficiency with HVAC calculation tools and 3D model review tools such as PDMS, E3D, Navisworks, or equivalent tools.
  • Strong analytical and synthesis abilities and the ability to communicate with senior stakeholders.
  • Professional English proficiency at B2 level or higher is desired.

Responsibilities

  • Define the architecture of HVAC and nuclear ventilation systems in line with safety, operations, maintenance, and radiation-protection requirements.
  • Lead HVAC design studies, including thermal balances and sizing of equipment and air, hydraulic, and refrigeration networks.
  • Define nuclear ventilation principles, including pressure cascades, dynamic containment, filtration, air renewal, management of radiological-risk areas, 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 the integration of HVAC installations into 3D models and ensure their constructability, operability, and maintainability.
  • Provide technical expertise on installation issues, including network routing, multidisciplinary interfaces, supports, maintenance access, and assembly sequences.
  • Conduct technical reviews of supplier studies and critically analyze 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 deviations encountered during design, installation, testing, or start-up phases.
  • Ensure the capitalization of lessons learned 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.

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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