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COWI

Senior Mechanical Engineer - Water 1

Derby
Posted about 22 hours ago
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Senior Mechanical Design Engineer

Location: London

Position Type: Permanent

Working Arrangement: Office/Home Hybrid


About the Role

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.

Skills and Qualifications

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I’m in my final year doing Economics and I don’t know whether to apply for grad schemes now or do a masters first. What do you think?

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Graduate Consultant — 2026 Scheme

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£35,000/yr

Why you're a good match

Strong

Your economics background and your summer at a regional bank line up with what PwC looks for on the consulting scheme. Applications close in four weeks.

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Why you're a good match

You’ve got the grades and the economics background, and your bank internship is exactly the experience this scheme looks for. Apply soon — deadlines close within the month.

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Experience fit

Your summer at the bank plus your econometrics coursework map directly to the day-one responsibilities on this scheme — client modelling, market briefings, and deal support.

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No noise. No "maybe this fits." Just roles with a clear explanation of why they're right — and where to focus when applying.

The first step to success in this role is that you are eager to collaborate with the people around you, whether they are colleagues, partners, or customers. Developing ties with others is something you do by acting respectfully and delivering on your promises. And you never get set in your ways but keep exploring new insights and ways to improve.

On top of that, you’ll have:

  • 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

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To us, a fair reward is more than a competitive salary. We want to take care of our people professionally and personally as well.

Some of our benefits include:

  • 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 include:

  • Cycle-to-work scheme
  • Electric vehicle lease
  • Corporate gym membership
  • Annual Rail card (available for under 30s)

Get in Touch

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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Skills

Mechanical Infrastructure Design
HVAC
Smoke Control
Natural Ventilation
CHW
LTHW
Refrigerant-based Systems
IES Software
Project Management
Technical Documentation
Design Review
Risk Management
Mentoring
British Standards
Building Regulations
Rail Standards

Location

Derby, England, United Kingdom

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