Mechanical Engineer - Water / Wastewater (Senior / Principal)

Water/Wastewater Infrastructure | AMP 8| SROs | Senior Leadership | Mechanical Design

Shape the Future of Water Infrastructure with Egis

• London | Bristol | Manchester (Hybrid)
• Senior Leadership Role | 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 infrastructures that 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.

Job Description

Why This Role?

As our Mechanical Engineering Lead, you’ll take a national leadership position shaping and expanding our mechanical engineering capability. You’ll guide the delivery of major water and wastewater infrastructure programmes, influence strategic decisions for high‑profile UK water clients, and play a pivotal role in embedding best practice across the business. This is your opportunity to shape direction, raise standards, and build a high‑performing mechanical engineering team from the ground up.

If you’re energised by joining a fast‑growing, newly‑formed UK water practice , where you can directly influence the team’s trajectory and help shape the future of national water infrastructure, then this role offers you the platform to make a genuine, lasting impact.

Key Responsibilities

Technical & Design Leadership

• Lead the mechanical design of municipal water and wastewater treatment projects across the UK, covering feasibility, optioneering, concept, outline and detailed design across major programmes (e.g. AMP8, WINEP, SROs, etc).
• Set and uphold the mechanical design approach for treatment work: in-house standards (in line with water industry asset standards), checking, and consistency of outputs across projects and teams.
• Fulfil Designer duties under CDM 2015 for mechanical works, ensuring effective hazard identification and risk reduction and, where designated, supporting or undertaking Principal Designer responsibilities on assigned projects.
• Take ownership of the mechanical scope within multidisciplinary delivery, driving clear decisions on operability, maintainability, access, and whole-life performance.
• Produce and quality-check core mechanical outputs such as equipment selection, specifications, datasheets, calculations, schedules, and design narratives (e.g., pumping and packaged plant where relevant).

Client Engagement & Delivery

• Act as a senior client-facing technical lead, running workshops and design reviews, advising clients, and building long-term relationships with regulated water stakeholders.
• Provide design assurance and technical support during delivery phases, including reviewing contractor submissions, answering design queries, and supporting handover/commissioning activities when required.

Business Growth & Team Development

• Grow the mechanical capability through business development and work winning: identify opportunities, shape scopes, contribute to bids, and build a healthy forward pipeline.
• Help translate the UK water growth strategy into practical actions: target sectors, priority accounts, capability gaps, and delivery plans focused on treatment.
• Build the mechanical arm of the UK water consultancy team through recruitment, mentoring and skills development, including pathways, coaching and technical governance.
• Work with the wider business to evolve new and improved service offerings, including sustainability-led and value-focused mechanical solutions for treatment assets.

Qualifications

What do we need from you

• BEng/MEng (or equivalent) in Mechanical Engineering.
• Registered as a chartered engineer (CEng) or equivalent professional membership (e.g., IMechE or similar).
• Strong track record in the UK regulated water market, focused on municipal water and/or wastewater treatment.
• Demonstrated leadership across the design lifecycle: feasibility/optioneering, concept, outline and detailed design, plus support through delivery stages as the designer.
• Practical depth in treatment mechanical engineering: selecting and specifying equipment, integrating packaged plant, and producing/reviewing high-quality design documentation.
• Working knowledge of UK water industry standards, regulatory expectations, and safety-by-design/CDM as applied to treatment facilities.
• Experience supporting projects delivered via frameworks, alliances and/or D&B models, including design review, technical query response, and design assurance.
• Confident client and stakeholder manager; clear communicator, comfortable presenting, and able to lead technical conversations with credibility.
• Evidence of BD/work-winning contribution (or strong demonstrable aptitude): opportunity shaping, bid inputs, client development, and service-line growth.
• People leadership experience: building teams, hiring and mentoring, and setting a positive, delivery-focused culture.

Please note that you must have the right to work in the UK to be considered for this position.

Additional Information

What’s in It for You?

• An exciting new growth role in a fast‑organic growing UK business, offering clear and accelerated career progression
• Top Employers 2025 - Egis recognised across four continents for excellence in HR practices, having been awarded the prestigious Top Employer 2025 certification. Top Employers Institute is the global authority on recognising excellence in people practices.
• A global leader in green infrastructure - we’re proud to lead the way in sustainable infrastructure, mobility and energy, innovating across the entire value chain and every aspect of the built environment. 
• Highly competitive leadership‑level reward package
• Hybrid and flexible working
• 26+ days annual leave plus bank holidays
• Professional development, chartership support & global mobility
• Supportive, inclusive culture driven by sustainability and long‑term community impact

Ready to Lead?

Join Egis and play a pivotal role in shaping the future of sustainable water infrastructure across the UK.

We are committed to our planet

In each project we design, engineer and operate we care deeply about the legacy we’re leaving behind. As part of our team, you’ll have a unique opportunity to use your skills and expertise to shape a better future for our communities in the UK, and all around the globe.

Our commitment is translated in the work carried out by our Egis Foundation, which funds concrete actions to address the climate crisis and is focused on educational and social initiatives that will help in the responsible and sustainable shift towards a sustainable world.

We are an Equal Opportunities employer and we strive to build a workforce that truly reflects the communities we represent. We welcome candidates from all backgrounds, regardless of age, disability, gender, gender identity, gender expression, race, religion or belief, sexual orientation, socioeconomic background, and any other protected characteristic. If you decide to apply for an opportunity with us, your application will be assessed based purely on your experience, the essential and desirable criteria, and your suitability for the role. We value each and every one’s contribution as this builds our culture and means that if you work with us, you will be included, listened to, and respected.