Senior Principal Mechanical Engineer - Water​/Wastewater

Senior Principal Mechanical Engineer – UK Water/Wastewater

London | Bristol | Manchester (Hybrid)

Mechanical Engineering Design | UK-Wide Impact | High-Growth Environment

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.

• Provide senior technical leadership for the mechanical discipline within the UK water/wastewater treatment design team.
• Act as mechanical discipline lead, sub‑lead or senior technical authority on complex treatment projects across design, construction support, commissioning and handover.
• Set and maintain mechanical design standards, checking requirements, design risk processes, digital workflows and quality expectations.
• Lead and assure complex mechanical deliverables, key technical decisions, equipment strategies, supplier packages, contractor submissions and multidisciplinary interfaces.
• Drive integrated coordination across Process, EICA, civil/structural, architectural, MEP, construction, commissioning and operations teams.
• Lead senior client engagement, technical workshops, optioneering, value engineering, design reviews and constructability/maintainability reviews.
• Embed modern delivery approaches including digital design, hydraulic analysis, BIM/3D coordination, automation, standardisation, data‑led decision making and supplier integration.
• Support project directors and project managers with technical risk, scope, resourcing, programme, budget, change control and design quality.
• Build and develop the mechanical sub‑team through recruitment, mentoring, line management, succession planning and professional development.
• Support business planning, work winning, client development, bid strategy and growth of Egis' UK water/wastewater treatment capability.

• BEng/MEng or equivalent in Mechanical Engineering.
• Chartered Engineer or Incorporated Engineer status with a relevant professional institution, such as IMechE.
• Typically 10–12+ years’ relevant mechanical engineering design experience.
• Background must be from water, wastewater, biosolids/bioresources or oil & gas.
• Proven track record leading mechanical design and technical assurance on complex multidisciplinary projects.
• Deep technical expertise in mechanical treatment/process systems, including pumps, pipework, valves, tanks, packaged plant, lifting systems, hydraulics and maintainability.
• Strong understanding of UK regulated water sector drivers, water company asset standards, CDM 2015, safety‑by‑design, environmental/regulatory requirements and common delivery models.
• Demonstrable experience developing people, including mentoring, line management, technical coaching, recruitment or resource planning.
• Strong client and stakeholder management skills, with credibility to lead senior technical conversations and influence project direction.
• Strong commercial and delivery awareness, including scope development, fee estimating, programme/resource planning, risk management and change control.
• Strong digital and innovation mindset, with experience embedding improved tools, data workflows, BIM/MEP coordination, hydraulic analysis, automation or standardised delivery approaches.

• Experience as mechanical discipline lead, design manager, technical director, associate‑level lead or sub‑team lead within consultancy, contractor, water company, technology provider or oil & gas/process engineering business.
• Strong UK water sector client…