Senior Mechanical Engineer - Water in Warrington

At Jacobs, we're challenging today to reinvent tomorrow by solving the world's most critical problems for thriving cities, resilient environments, mission‑critical outcomes, operational advancement, scientific discovery and cutting‑edge manufacturing, turning abstract ideas into realities that transform the world for good.

Your impact

With a number of positions available, this is a rare chance to step into a newly created role at the forefront of the UK’s most significant water sector transformation in decades.

If you’re driven by meaningful engineering challenges and want your work to directly improve the lives of millions, this opportunity puts you right at the heart of it.

From early‑stage feasibility and Front‑End Engineering Design (FEED) studies through to detailed design, commissioning and operational handover, you’ll play a key role in shaping innovative engineering solutions that improve essential water and wastewater services for millions of customers.

You’ll help define project scope, develop investment‑ready solutions, assess technical risks and establish robust delivery strategies that set projects up for successful execution.

You’ll collaborate with major water companies, including United Utilities, Northumbrian Water, Thames Water, Severn Trent Water, and Anglian Water to shape and deliver high‑value, complex Design & Build CAPEX and OPEX programmes.

• Your remit will include
• Leading and contributing to FEED and optioneering studies, developing technical solutions that balance performance, risk, sustainability and whole‑life cost.
• Engineering and design of critical water and wastewater assets — from pumping stations to treatment plants.
• Value engineering and buildability improvements that make real‑world impact.
• Feasibility studies, detailed designs, and commissioning support for major infrastructure.
• High‑quality technical outputs including layouts, specifications, datasheets, and P&IDs.
• Equipment sizing and specification across pumps, blowers, valves, screening, dosing, and odour control systems.
• Site investigations and engagement with clients, contractors, and suppliers.
• Achieve compliance with UK water industry standards, health & safety, and environmental requirements.
• Technical guidance, mentoring, and collaboration within multidisciplinary teams.
• Project planning support including scheduling, risk, change control, and forecasting.
• Early integration of constructability and commissioning into design solutions.

Why apply?

• Once‑in‑a‑generation investment in UK water infrastructure.
• Opportunity to collaborate with leading UK water companies, securing exposure to national‑scale programmes.
• End‑to‑end project influence — far beyond design alone.
• Career‑defining engineering challenges with real social impact.
• A platform to innovate, challenge convention, and shape future resilience.
• Here’s what you’ll need
• Degree in Mechanical Engineering.
• Professional Membership or working towards/holding chartered status (e. g., IMech E or equivalent).
• Sound understanding of mechanical process‑based systems used in sectors such as water/wastewater/effluent/biomass treatment.
• Knowledge of UK industry standards, H&S, and environmental compliance.
• Robust understanding of current health, safety and welfare legislation.
• Experience across the project lifecycle within infrastructure or similar complex environments.
• Familiarity with design tools such as Auto CAD, Revit, or BIM.

As a disability confident employer, we will interview disabled candidates who best meet the criteria.

We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

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