COWI
Senior Mechanical Engineer - Water 1

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Senior Mechanical Design Engineer
Location: London
Position Type: Permanent
Office/Home Hybrid Working
Do you want to be a part of a growing M&E team? Can you collaborate with colleagues across UK and International projects? Are you experienced in Mechanical Infrastructure Design? Then, this could be the next adventure in your career.
Create Solutions that will enable a better tomorrow
To further our mechanical capability, we are seeking an experienced Senior Mechanical Engineer to join our growing engineering team. This is an exciting opportunity to oversee the delivery of complex and high-profile projects across a range of subsectors, including highways, rail, aviation, data centres and buildings within infrastructure.
While our portfolio has a clear focus on major infrastructure projects, we are looking for individuals who bring broad mechanical engineering services expertise and are eager to work on diverse, multidisciplinary projects that shape the built environment.
Key Responsibilities
- Overseeing the design and delivery of mechanical engineering solutions across a variety of projects.
- Developing and reviewing mechanical designs, calculations, specifications, reports, and technical documentation.
- Coordinating with multidisciplinary teams including civil, structural, architectural, electrical, fire, and systems engineers.
- Managing interfaces with clients, contractors, stakeholders, and regulatory authorities.
- Ensuring compliance with relevant standards, codes, and project requirements, including Network Rail, HS2, TfL, British Standards, and Building Regulations where applicable.
- Supporting design reviews, technical assurance processes, and risk management activities.
- Mentoring and supporting junior engineers and technicians.
- Contributing to project planning, programme management, and resource forecasting.
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Skills and Qualifications
- A degree in Mechanical Engineering or a related discipline
- Achieved Chartered Engineer (CEng) or be working towards it
- In-depth knowledge of mechanical systems including HVAC, smoke control, natural ventilation, CHW, LTHW and refrigerant-based systems
- Experience working through all project stages from feasibility and concept design to detailed design and construction support
- Solid knowledge of British Standards and Building Regulations
- Knowledge of rail standards and experience delivering mechanical engineering designs for major infrastructure projects
- Good knowledge of IES software
About Us
At COWI, we work together with our customers to shape a sustainable and liveable world. We do it by applying our knowledge and curiosity – and sometimes even our courage – to create the solutions the world needs today to enable a better tomorrow. We support our customers’ transition towards increased sustainability. We strive to lead by example by embedding environmental management, social responsibility and good governance into our business practices and the options we provide to our customers.
We value differences and development and cultivate an environment of belonging and having fun. Because that is what brings out the best in you, at work and at home.
With offices primarily located in the Nordic region, the UK, North America and India, we are currently more than 7,500 people who bring their expertise in engineering, architecture, energy and environment into play.
What We Offer
To us, a fair reward is more than a competitive salary. We want to take care of our people professionally and personally as well.


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Benefits
- 28 days' holiday plus all UK bank and public holidays
- Formalised development plans and yearly promotion opportunities
- Private health care, for you and a contribution from you for your immediate dependents
- Flexible and hybrid working conditions
- Annual subscription fees paid for your membership of two Professional Institutions
- Group personal pension scheme – salary exchange
- Life assurance
- Maternity Leave: 1-20 weeks full pay, 21-26 weeks half pay, 27-39 Statutory (SMP) 40-52 weeks unpaid (eligibility criteria will apply)
- Paternity Leave: 12 weeks full pay (eligibility criteria will apply)
Optional Benefits
- Cycle-to-work scheme
- Electric vehicle lease
- Corporate gym membership
- Annual Rail card (available for under 30s)
Got More Questions?
If you have any unanswered questions about the role or what we have to offer, please reach out to our Talent Acquisition Specialist Laura Dobson at LADN@COWI.COM.
Experienced in Mechanical infrastructure design but not as a Senior Engineer? We welcome engineers at all experience levels as our Mechanical & Electrical discipline continues to grow. Please contact Laura if you'd like a chat about what a career and life at COWI could look like.
Get to know us even better at our website, www.cowi.com, where you can learn more about our projects, our strategy, what we want to achieve and what life is like at COWI.
Equal Opportunity Employer
COWI provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to ethnicity, colour, religion, gender, national origin, age or disability. This policy applies to all terms and conditions of employment, including recruiting, hiring,
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