Join our dynamic multidisciplinary water & wastewater team and lead innovative projects across the UK and worldwide. We are seeking a Senior Mechanical Engineer who thrives in collaborative environments, enjoys solving complex technical challenges, and is passionate about delivering high-quality, sustainable engineering solutions for water and wastewater infrastructure.
As a Senior Mechanical Engineer, you will:
- Collaborate with multidisciplinary teams across the UK and internationally to deliver successful water and wastewater projects.
- Lead and contribute to projects, ensuring delivery on time, on budget, and in line with OCU business governance.
- Provide expert guidance on engineering design deliverables, including calculations, drawings, and technical reports, following relevant codes and Purestream design standards.
- Ensure quality and safe design of technical solutions in accordance with UK and international standards.
- Communicate technical solutions clearly to clients, contractors, and colleagues through presentations, workshops, and safety reviews (including HAZOPs and ALMs).
- Engage with clients and construction teams on Design & Build projects to provide practical, innovative mechanical solutions.
- Assess existing water and wastewater infrastructure to develop mechanical designs for new and upgrade projects.
- Support compliance with CDM regulations, producing design and environmental risk assessments where required.
Essential
- Degree in Mechanical Engineering or equivalent; Chartered or Incorporated Engineer (IMechE or equivalent) or near completion.
- Hands-on experience in water and/or wastewater engineering design, including design & build projects in the UK.
- Strong technical knowledge of water sector infrastructure, WIMES, UK codes, and asset standards.
- Experience collaborating with contractors to implement engineering solutions effectively.
- Excellent interpersonal, verbal, and written communication skills; able to work independently and within multidisciplinary teams.
- Highly motivated, organised, and committed to delivering technical excellence.
- Flexible and willing to travel to project sites or client offices when required.
- Specialist knowledge in water or wastewater process mechanical systems.
- Experience in leading HAZOPs, ALMs, or similar safety and technical review workshops.
- Exposure to international projects and multidisciplinary collaborations.
- Experience in mentoring junior engineers or leading small technical teams.
At OCU, we believe that meaningful work should come with meaningful support. That's the principle behind Careers with Purpose, our commitment to ensuring every person at OCU feels supported, developed, and valued, not just in their role today, but throughout their career with us.
Alongside the opportunity to work on some of the UK's most significant infrastructure projects, we offer a benefits package that we are continuing to develop as we grow, and the kind of career acceleration that only comes from being inside a business moving at this pace.
As a rapidly growing organisation, there are genuine opportunities to progress, broaden your experience, and build a long-term career within OCU Group.
To apply, please submit your CV by 15/6/2026
For a confidential conversation about this opportunity, please contact Nicola Brooke
at
[email protected]
At OCU Group, we don’t just deliver infrastructure - we help power modern life.
As one of the UK’s fastest-growing utility and infrastructure businesses, we deliver complex, nationally critical projects across power, energy transition, water, telecoms, and digital infrastructure. Over the last five years, OCU has grown five-fold to a £1.1bn organisation, expanding both organically and through strategic acquisitions across the UK, Australia, New Zealand and India.
Our growth is driven by ambitious people, operational excellence, and a commitment to doing things properly. We work on projects that genuinely matter by supporting the UK’s energy transition, strengthening essential infrastructure, and helping build more sustainable communities for the future.
Whether you’re an experienced professional looking to take ownership of major projects and influence delivery at scale, or someone starting your career through an apprenticeship, graduate programme, or placement route, OCU offers real opportunity to grow, develop, and make an impact.
We are building a business where high performance, collaboration, innovation, and accountability sit at the centre of our culture. Our people are trusted to lead, encouraged to challenge thinking, and supported to continuously develop their skills and careers.
At OCU, you won’t just join a growing business, you’ll help shape it.
Our Culture & Values
At OCU, our values are at the heart of everything we do. We care about safety, lead with integrity, strive to be better every day, make a positive impact, and deliver to grow, together, as One Company United.
Our Commitment to Inclusion
At OCU Group, we believe diversity, inclusion, and belonging are fundamental to building stronger teams, better ideas, and a more successful business. We welcome applications from people of all backgrounds and are committed to creating an environment where everyone feels valued and supported.
As part of our commitment to fairness and equality, candidates may be asked to complete an equal opportunities monitoring form during the recruitment process. This information is used for monitoring purposes only and plays no part in hiring decisions.
We are proud to be a Disability Confident employer and are committed to offering interviews to candidates with disabilities or long-term health conditions who meet the essential criteria for the role.
To ensure that everyone has a fair opportunity to join our team, please inform us if you require any reasonable adjustments to our recruitment and interview process is, by emailing
[email protected].
