HVAC Design Engineer

Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements. Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.

Job Description

• Act as the primary interface between HVAC design teams and construction/installation teams.
• Develop and review HVAC designs and confirm accuracy of detailed specifications and engineering outputs.
• Perform technical assessments to ensure compliance with relevant standards and project requirements.
• Review and validate contractor documentation, drawings, method statements, and test plans.
• Support the integration of HVAC systems within broader mechanical, electrical, and building services designs.
• Participate in design coordination meetings and multi‑disciplinary reviews.
• Contribute to risk assessments, hazard reviews, and safety evaluations.
• Support commissioning activities, ensuring HVAC systems operate according to design intent.
• Provide engineering input for change management, design updates, and configuration control.
• Maintain consistent communication with project managers, quality teams, and other engineering disciplines.

Benefits

• Over 55 years in nuclear engineering.
• Ranked among the top 3 largest nuclear engineering companies.
• Attractive social benefits, including an engaging Employee Committee and holiday bonuses.
• Ongoing training with numerous career opportunities.
• 70% of our managers are promoted internally!
• Hybrid work: 1-2 days remote per week.

Qualifications

• Degree in Mechanical Engineering, Building Services Engineering, or a related discipline.
• Minimum of 3–5 years of relevant experience in HVAC design, building services engineering, or system integration.
• Familiarity with HVAC codes and standards (e.g., ASHRAE, CIBSE, ISO, local regulations).
• Ability to interpret technical drawings, specifications, and engineering documents.
• Experience working with contractors, site teams, and multi‑disciplinary engineering groups.
• Strong communication skills and the ability to work collaboratively in a project‑based environment.
• Experience in regulated industries or complex infrastructure projects is advantageous but not essential.

Preferred Skills

• Proficiency with HVAC design software (e.g., Revit, AutoCAD, BIM tools, load calculation software).
• Understanding of ventilation, heat load calculations, ductwork sizing, equipment selection, and system performance analysis.
• Knowledge of commissioning processes and quality assurance procedures.
• Strong problem‑solving ability and attention to detail.

Additional Information

Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared to a minimum SC level. We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter! Bring your unique contributions and help us shape the future.