Senior / Principal Mechanical Engineer ( Building Services)

Job Title - Senior / Principal Mechanical Building Services Engineer

Location - Belfast

Joining Arup

Arup’s purpose, shared values and collaborative approach has set us apart for 80 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 have a new opportunity for a Chartered Mechanical Engineer who is excited by technically challenging work on cutting-edge projects to join our creative and collaborative Building Engineering Team in the Belfast.

Our projects span the globe, offering the opportunity to thrive in an international, multicultural environment. You’ll contribute to some of the most innovative and inspiring buildings worldwide, working alongside leading architects. Current and recent projects include rail infrastructure, major science and industry developments in the UK, university buildings, and complex, sustainable residential and healthcare facilities.

In this role, you’ll lead the design and delivery of building services systems, applying your expertise across all aspects of mechanical engineering. You’ll develop system strategies, coordinate with project teams and stakeholders, and guide the thermal and comfort analysis of buildings and spaces. You’ll also manage the production of models, drawings, reports, and specifications—ensuring delivery to budget and deadlines—while supervising and collaborating with colleagues across disciplines.

Experience in the Science, Industry and Technology sector at detailed design stage, or in Rail buildings across all design assurance levels (DAL), is highly valued.

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 to speak to people who:

• Are Chartered Engineers ( IMechE / CIBSE) with broad, hands-on experience in Building Services systems, installations, and a range of project sectors. We also welcome interest from candidates who are within one year of achieving Chartered status and possess comparable experience and expertise.

• Bring leadership skills to support and develop others through guidance, training, and constructive feedback.
• Have a strong interest in sustainable building design, with a focus on energy and carbon performance, and contributes to achieving optimal project outcomes.
• Have experience delivering complex projects, including the integration of renewable technologies and suitability assessments, using tools like IES for energy modelling.
• Demonstrate commercial awareness, with the ability to plan resources, manage budgets, and contribute to work-winning activities such as fee estimation and proposal preparation.

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.

Our Application Process

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.

We may close the role earlier than the advertised date should we receive a large number of applications, so please ensure you apply early.