United Infrastructure Ltd
Senior Mechanical Design Engineer
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Job Title | Senior Mechanical Design Engineer
Location | Havant or Tamworth
Line Manager | Design Manager
About Us
AFECO is an engineering services provider, delivering high-quality process and MEICA design and installation projects predominantly across the South of England and Midlands for the water industry. We have excellent in-house engineering teams capable of delivering all stages of the project cycle, from concept through to commissioning, with a strong focus on process-led innovative and robust yet appropriate solutions. We have a portfolio of varied projects covering both wastewater and clean water projects for planned and reactive projects.
Due to the expansion of our team, we are currently recruiting for a Senior Mechanical Design Engineer to work within our multi-disciplinary teams. This is a great opportunity for enthusiastic individuals who fit in with our company values and are keen to develop in a forward-thinking organisation.
Role Purpose
The Senior Mechanical Design Engineer will lead the mechanical design of water and wastewater treatment assets across the project lifecycle, from concept and detailed design through to construction support and commissioning. The role requires strong technical capability, sound engineering judgement, and the ability to mentor junior engineers while working collaboratively with multi-disciplinary teams.
Key Responsibilities
Technical Design & Delivery
- Lead mechanical design activities for water and wastewater treatment projects, including pumping stations, treatment works, pipelines, and associated infrastructure.
- Produce and review mechanical designs, calculations, specifications, schedules, and drawings.
- Ensure designs comply with relevant standards, legislation, client specifications, and health & safety requirements.
- Undertake optioneering and value engineering to balance cost, performance, risk, and operability.
- Support constructability, commissioning, and handover activities.
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Equipment & Systems
- Specify, size, and select mechanical equipment such as pumps, valves, screens, blowers, mixers, and mechanical treatment processes.
- Review supplier technical submissions and manage technical interfaces with vendors.
- Assess whole-life cost, reliability, and maintainability of mechanical systems.
Project & Stakeholder Interface
- Work closely with process, civil, electrical, and ICA engineers to deliver integrated solutions.
- Liaise with clients, contractors, suppliers, and operations teams.
- Provide technical input during design reviews, HAZID/HAZOP, and risk workshops.
Mentorship & Quality
- Mentor and technically support graduate and intermediate engineers.
- Review and approve work produced by others.
- Contribute to the development of internal standards, best practices, and lessons learned.
Qualifications & Experience
Essential
- Degree (or equivalent) in Mechanical Engineering
- Significant experience in the water or wastewater sector
- Strong knowledge of mechanical equipment used in water treatment and conveyance
- Experience delivering designs through concept, detailed design, and construction stages
- Familiarity with relevant standards (e.g. ISO, BS, EN, WIMES, client standards)
Desirable
- Experience working on regulated water frameworks
- Site experience including commissioning or construction support
- Knowledge of asset management and whole-life cost analysis
- Experience with NEC or other engineering contracts
Technical Skills
- Mechanical design and specification
- Pumping system design and hydraulics (desirable)
- Design risk assessment and CDM compliance
- 2D/3D CAD tools (e.g. AutoCAD, SolidWorks)
- Engineering calculations and reports
Salary and Benefits
- Medicash plan
- Life insurance
- Benefits portal
- Company pension
- 25 days holiday (plus bank holidays)
At AFECO, we value our employees and encourage and support them to develop themselves and their career through training and progression. We offer the opportunity to work on a range of project types and sizes in the water sector, including our own internally developed products and solutions. We are a privately owned business with a friendly and open culture and are dedicated to creating and maintaining a workforce that is highly skilled and motivated.
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As a company, we are committed to equal opportunities for all and do not discriminate on the grounds of race, religion or belief, sexual orientation, gender reassignment, marital or civil partner status, sex, disability, or age.
Join us at AFECO and be part of our mission to deliver innovative and sustainable solutions to the complex infrastructure needs of the UK.
Here at United Infrastructure, we invest in our people and firmly believe that our workforce is our most valuable asset. A driving force for success and the core to achieving our vision of creating a connected and sustainable future, our team is the heart of our organisation. Are you looking to be part of an exciting journey within an evolving business? Want to learn something new, every single day? Then you’ve come to the right place.
Introduce yourself to our recruiters and we'll get in touch if there's a role that seems like a good match.
A fast-paced, diverse, and hugely ambitious business, we welcome challengers, innovators, and people who embrace change. Establish yourself in a creative environment that champions freedom of expression and supports you in your personal and professional development – because together, we achieve more.
Ready to take the next step in your career? United Infrastructure operates a direct sourcing model and does not accept speculative CVs from recruitment agencies. Any CVs submitted without prior agreement will be considered a gift and the candidate will be deemed to have been introduced directly. No fees will be payable in these circumstances.
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