Principal Mechanical Engineer - Water​/Wastewater

About the Role

The UK water sector is entering a period of unprecedented investment and transformation. As Egis accelerates the growth of its Water Business in the UK, we are building a high-performing Mechanical Engineering team to help shape this next chapter.

We are inviting applicants who want to play a meaningful role in delivering major water and wastewater programmes in the UK. Working within a collaborative, multidisciplinary environment, you will contribute to technically robust, sustainable and innovative treatment solutions across nationally significant projects.

This is a rare opportunity to join at a key stage of our UK growth journey, helping to establish, shape and expand a Mechanical engineering capability built on Egis' global infrastructure expertise and long-term commitment to the sector.

• Lead mechanical design delivery on multidisciplinary water/wastewater treatment projects across the full design lifecycle.
• Act as mechanical technical lead on projects, owning design strategy, key decisions, interfaces, risks and quality of deliverables.
• Review and approve mechanical calculations, specifications, datasheets, reports, P&IDs, layouts, schedules, drawings and supplier/contractor submissions.
• Lead equipment selection and mechanical design for pumps, pipework, valves, tanks, lifting systems, packaged plant, treatment equipment and associated process systems.
• Lead mechanical input to optioneering, value engineering, design reviews, HAZOP/SWIFT, constructability, maintainability and commissioning reviews.
• Drive multidisciplinary coordination across Process, EICA, civil/structural, architectural, MEP, construction and operations teams.
• Promote lean and digitally enabled delivery through standardised tools, BIM/3D coordination, hydraulic analysis, data-led design and reusable templates.
• Provide technical assurance and support project managers with technical risk, scope, resourcing, programme and change control.
• Mentor and manage engineers where appropriate, supporting recruitment, development and chartership progression.
• Contribute to bids, client engagement, opportunity shaping and growth of the mechanical capability.

• BEng/MEng or equivalent in Mechanical Engineering.
• Chartered Engineer or Incorporated Engineer status with a relevant professional institution, such as IMechE.
• Typically 8-10+ years' relevant mechanical engineering design experience.
• Background must be from water, wastewater, biosolids/bioresources or oil & gas.
• Proven ability to act as mechanical discipline lead or senior technical lead on multidisciplinary projects.
• Strong technical expertise in mechanical treatment/process systems, including equipment selection, pumping, pipework, valves, hydraulics, layouts and packaged plant.
• Strong understanding of UK water industry standards, CDM 2015, safety-by-design, regulatory drivers and common delivery models.
• Ability to coordinate multidisciplinary interfaces and resolve complex mechanical design issues.
• Strong digital mindset, with experience applying modelling, automation, BIM/3D coordination, data analysis or standardised workflows.
• Confident client-facing communicator with experience leading workshops, technical reviews and design discussions.
• Experience mentoring or managing engineers and supporting technical capability development.

• Deep experience in wastewater treatment, clean water treatment, sludge/bioresources, water reuse, pumping stations, chemical dosing, odour control, energy recovery, package plant or complex process systems.
• Experience delivering AMP8, WINEP, SRO, D&B, framework, alliance or contractor-led projects.
• Experience developing mechanical design standards, calculation tools, equipment…