As part of the United Infrastructure Group, we are a dynamic and innovative specialist engineering services, solutions and products provider focused on servicing our clients' immediate and future needs. We do this through the development of industry-changing cleantech products as well as through engineering delivery excellence.
We specialise in the design and delivery of process, mechanical, electrical and ICA engineering-based projects, products and solutions. Regardless of the project, they all pursue the same goal: to improve the efficiency and sustainability of our water, wastewater and waste treatment.
We have a team of highly skilled and experienced professionals with extensive consulting and contracting experience, including engineers, scientists and commercial managers. Our knowledge and expertise spans more than 30 years, across industries including: water, wastewater, marine, energy and power sectors. At AFECO, we cover all stages of the innovation and project delivery cycle from concept through to operations.
Our aim is simple – to provide the most effective solutions and products on the market and thus, exceed clients expectations through market-leading technology. From technical through to commercial and management expertise, we have the in-house expertise to execute a range of projects from the most basic to highly complex.
Job title |SeniorMechanicalDesignEngineer
Location |Havant or Tamworth
Line Manager |DesignManager
About us
AFECO is an engineering services provider, deliveringhigh qualityprocess and MEICA design and installation projectspredominantly acrossthe South of England and Midlands for the water industry. We have excellent inhouse 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 yetappropriate 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 currentlyrecruiting foraSeniorMechanicalDesignEngineerto work within our multi-disciplinary teams.



This isa great opportunityfor 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 designscomply withrelevant 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
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 experiencein 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 employee's and encourage and support them to development themselves and their career through training and progression. We offer the chance to work on a range of project types and size 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 andmaintainingand workforce that is highly skilled and motivated. 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,disabilityor 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.
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📌 Senior Mechanical Design Engineer (New South Wales)
🏢 United Infrastructure
📍 New South Wales