Job Description

Job Title - Principal Mechanical Building Services Engineer
Location - Cardiff
Joining Arup
Arup's purpose, shared values and collaborative approach has set us apart for over 75 years, guiding how we shape a better world.
Arup's Building Services Engineers tackle diverse challenges - from sustainable strategies to fire suppression systems, and from drainage in high-rise buildings to supplying ultra-pure water and piping specialist gases and fluids for , facilities. Together with our and engineers, we provide integrated building services to our clients.
Watch this short clip to discover how Arup are shaping a better world and how you could be a part of it!
The Opportunity
We are looking for a passionate and dynamic Senior / Principal Engineer with excellent design, technical, and sustainability skills who enjoys working collaboratively in multi-professional design teams, taking responsibility for projects from inception to completion to achieve outstanding results. You will be able to demonstrate a solid background in the field of Mechanical Engineering Systems for building services, and a track record of multi-disciplinary design by bringing the best of Arup together.
You will join our creative and friendly Building Engineering team, choosing from one of our offices in the West (Cardiff or Bristol). A team that seeks to set new standards in the built environment. Challenging orthodoxy will be instinctive to you. You will possess motivation on the Digital front and seek to guide its evolution in the built environment.
In this role you will provide leadership to the MEP team on a portfolio of projects locally, nationally and internationally, having the responsibility of ensuring correct technical approaches are applied to the project are carried out appropriately to undertake the tasks at hand. You will be expected to have project management skills and will have remit for the financial performance of the projects including liaising directly with clients on fees and commercial matters, effectively overseeing total project delivery by enabling effective team management and delegation to ensure the efficient and satisfactory delivery of multiple and complex projects, reporting to the Project Director.
At Arup, you belong to an extraordinary collective - in which we encourage individuality to thrive. Our strength comes from how we respect, share and connect our diverse experiences, perspectives and ideas.
You will have the opportunity do socially useful work that has meaning - to Arup, to your career, to our members and to the clients and communities we serve.
Is this role right for you?
We are looking for people who:

• Hold a degree in Mechanical Engineering, HVAC, Building Services Engineering, or a closely related discipline, and are Chartered (CEng) with a recognised professional body such as IMechE or CIBSE

• Have extensive experience in winning and delivering a range of medium - large UK projects from concept to completion.
• Have the ability to provide technical leadership of multi-disciplinary design teams including external sub-consultants.
• Have strong awareness of appropriate sector-specific legislation, regulatory requirements and design guidance and future trends.

Not ready to apply just yet, or have a few questions? Contact Louise Raisbeck ). Please note, to ensure we remain GDPR compliant do not send your CV directly to us via this email.
What we offer you
At Arup, we care about each member's success, so we can grow together.
Guided by our values, we provide an attractive total reward package that recognises the contribution of each of our members to our shared success. As well as competitive, fair and equitable pay, we offer a career in which all of our members can belong, grow and thrive - through benefits that support health and wellbeing, a wide range of learning opportunities and many possibilities to have an impact through the work they do.
We are owned in trust on behalf of our members, giving us the freedom, with personal responsibility, to set our own direction and choose work that aligns with our purpose and adds to Arup's legacy. Our members collaborate on ambitious projects to deliver remarkable outcomes for our clients and communities. Profit Share is a key part of our reward, enabling members to share in the results of our collective efforts.
We also provide Private medical insurance, Life assurance, Accident insurance and Income protection cover. In addition, you'll have access to flexible benefits to help you look after all aspects of your wellbeing and give you the freedom and flexibility to find the best solutions for you, your family, and your individual needs.
Different people, shared values.
Arup is an equal opportunity employer that actively promotes and nurtures a diverse and inclusive workforce. We welcome applications from individuals of all backgrounds, regardless of age (within legal limits), gender identity or expression, marital status, disability, neurotype or mental health, race or ethnicity, faith or belief, sexual orientation, socioeconomic background, and whether you're pregnant or on family leave. We are an open environment that embraces diverse experiences, perspectives, and ideas - this drives our excellence.
Guided by our values and alignment with the UN Sustainable Development Goals, we create and contribute to equitable spaces and systems, while cultivating a sense of belonging for all. Our internal employee networks support our inclusive culture: from race, ethnicity and cross-cultural working to gender equity and LGBTQ+ and disability inclusion - we aim to create a space for you to express yourself and make a positive difference.
Discover more about life at Arup at .
We are committed to making our recruitment process and workplaces accessible to all candidates. Please contact Louise Raisbeck to let us know if you need any assistance or reasonable adjustments throughout your application or interview process, and/or to perform the essential functions of the role. We will do everything we can to support you.
Our Application Process
To understand what to expect next, please visit our .
Stay safe online - Arup will never ask for payment or your bank details as part of our recruitment process.
Recruitment Agencies - We have a Preferred Supplier List of trusted partners to assist us when required and do not acknowledge any speculative CVs or unsolicited candidate introductions from agencies not on the list.
Closing date: 23rd October 2025 - We may close the role earlier than the advertised date should we receive a large number of applications, so please ensure you apply early
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Skills Required