Principal Mechanical Designer - HVAC
For 50 years, we've been driven by the firm belief that engineers are the architects of tomorrow's world, leading the way with their daring, their expertise and their ability to push boundaries.
Every day, our 5,700 employees innovate for our clients, partnering the world's greatest engineering projects in the fields of energy, healthcare, life sciences and transport.
A fast-growing international Group, we are present in 14 countries (in Europe, the Middle East, Asia and Africa).

Job Description

Assystem are looking for a senior/principal designer to provide a supporting role to deliver HVAC systems design packages, these will include C5/C3 extract and C2/C0 supply & extract system

You would be required to assist in preparation for design reviews & HAZOPs and give support with progress reporting and ensuring successful, timely delivery of design work.

You will work as a team member, oversee senior designer & designer grade staff, liaise closely with 3D-modellers and have constructive dialogue with staff from all levels & disciplines.

In addition, you would be required to:
produce drawings (VFDs, GAs & SLDs), calculations, CDM risk assessments and OIMSs
input to specifications & other miscellaneous documents supporting the HVAC design process
carry out site surveys of HVAC systems
level 3 checking of drawings produced by other designers.

Security clearance:
Whilst we encourage applications from all nationalities, Assystem within the UK are subject to security and export control restrictions due to the nature of work to be undertaken. These restrictions mean that factors including your nationality, any previous nationalities you have held, and/or your place of birth may limit those roles that you can perform for the organisation


It would be an advantage to be familiar with delivering projects using PDMS.

Any prior experience of cell, laboratory & glovebox design would be preferable.

Experience of using Hevacomp software would be an advantage.

Must have extensive engineering experience working within a highly regulated industry, 10 of which should have ideally been gained within the nuclear industry.

Fully conversant with UK Statutory Regulations and industry design guides and standards relating to this discipline.

Software packages

AutodeskCAD, Navisworks Freedom Viewer, MS Office suite of programmes including Visio, SL network/IT access.

For an informal, confidential conversation about this role or to discuss other opportunities within Assystem please contact Louise O’Neill on the following:

Direct line - 01254 927580

Mobile - 07467485141

Email -

At Assystem, everyone holds the reins for their own careers. Our role is to offer you the opportunities and resources you need to reach your full potential.

So why not join us and help shape the engineering landscape of the future?