Principal Mechanical Engineer - Water​/Wastewater

Company Description

Water | Wastewater | Biosolids/Sludge | AMP 8 | SROs | MEP-Led Team

Water | Wastewater | Biosolids/Sludge | AMP 8 | SROs | MEP-Led Team

• London | Bristol | Manchester (Hybrid)
• Mechanical Engineering Design | UK‑Wide Impact | High‑Growth Environment

Egis is expanding rapidly in the UK, backed by a global team of more than 23,500 experts across 70+ countries. We design and deliver intelligent, sustainable infrastructure to address climate challenges and strengthen community resilience. As part of our fast‑growing UK Water team, you will join an agile environment where progression is quick, visibility is high, and your impact is immediate.

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…