Senior​/Principal Mechanical Engineer ( Building Services

Job Title – Senior / Principal Mechanical Building Services Engineer

Job Title - Senior / Principal Mechanical Building Services Engineer

Location - Belfast

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 healthcare, science and industry facilities. Together with our mechanical and electrical engineers, we provide integrated building services to our clients.

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.

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 contribute 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.

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.

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.

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