Senior Principal Process Engineer - Water / Wastewater

Egis; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Hybrid working

Annual leave 26+ days

Professional development

Chartership support

Job summary

Egis is looking for a Senior Principal Process Engineer to lead the UK water/wastewater design discipline. You will guide major municipal and industrial treatment projects, ensuring robust, sustainable solutions across design, construction, commissioning and handover.

You will mentor the process team, shape design standards and engage senior clients while applying model-informed decision making and data-led design to optimise performance and risk management.

Qualifications

• A degree in Chemical/Process Engineering or closely related field.
• Chartered Engineer or Incorporated Engineer status preferred.
• 10–12+ years’ process design experience in water/wastewater.
• Experience leading process design and technical assurance on complex projects.

Responsibilities

• Provide senior technical leadership for the process discipline within the UK water/wastewater design team.
• Act as process discipline lead or senior technical authority on complex projects across design, construction, commissioning and handover.
• Set and maintain process design standards, modelling approaches, design risk processes, workflows and QA expectations.
• Lead complex process deliverables, treatment strategies, process models, key technical decisions and interfaces.
• Drive integrated coordination across Process, Mechanical, EICA, civil/structural, MEP, construction and operations teams.
• Lead client engagement, workshops, optioneering, value engineering and design reviews.
• Embed modern delivery approaches including process simulation, data-led design and digital tools.
• Support project directors with risk, scope, resourcing, programme and budget.

Skills

Process design leadership

Process modelling

UK water sector knowledge

Mentoring & team development

Stakeholder management

Quality assurance

Design standards

Change control

Mass balance

PFDs & P&IDs

Education

BEng/MEng in Chemical Engineering

Chartered Engineer (IChemE)

Tools

BioWin

SUMO

Dynamizu

Job description

Senior Principal Process Engineer – UK Water/Wastewater

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

Shape the Future of Water Infrastructure with Egis

• London | Bristol | Manchester (Hybrid)
• Process 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.

Job Description

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 Process 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 municipal and industrial sectors. 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 process engineering capability built on Egis’ global infrastructure expertise and long‑term commitment to the sector.

Key Responsibilities

• Provide senior technical leadership for the process discipline within the UK water/wastewater treatment design team.
• Act as process discipline lead, sub‑lead or senior technical authority on complex treatment projects across design, construction support, commissioning and handover.
• Set and maintain process design standards, checking requirements, modelling approaches, design risk processes, digital workflows and quality expectations.
• Lead and assure complex process deliverables, treatment strategies, process models, key technical decisions, supplier packages, contractor submissions and multidisciplinary interfaces.
• Drive integrated coordination across Process, Mechanical, EICA, civil/structural, architectural, MEP, construction, commissioning and operations teams.
• Lead senior client engagement, technical workshops, optioneering, value engineering, design reviews, process safety reviews and performance optimisation discussions.
• Embed modern delivery approaches including process simulation, data‑led design, automation, standardisation, digital tools and model‑informed decision making.
• Support project directors and project managers with technical risk, scope, resourcing, programme, budget, change control and design quality.
• Build and develop the process 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.

Qualifications

Minimum Requirements

• BEng/MEng or equivalent in Chemical Engineering, Process Engineering or closely related discipline.
• Chartered Engineer or Incorporated Engineer status with a relevant professional institution, such as IChemE.
• Typically 10–12+ years’ relevant process design experience.
• Background must be from water, wastewater and/or biosolids/sludge treatment design.
• Proven track record leading process design and technical assurance on complex multidisciplinary water/wastewater treatment projects.
• Deep technical expertise in treatment process design, process selection, mass balance, process capacity, PFDs, P&IDs, design basis development and commissioning/performance testing.
• Strong practical experience using process modelling/simulation packages such as BioWin, SUMO, Dynamizu or equivalent.
• Strong understanding of UK regulated water sector drivers, water company standards, CDM 2015, process safety, 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.

Desirable Skills / Knowledge

• Experience as process discipline lead, design manager, technical director, associate‑level lead or sub‑team lead within consultancy, contractor, water company or technology provider environments.
• Strong UK water sector client network and experience supporting account growth, opportunity shaping, bid leadership and work winning.
• Advanced experience with BioWin, SUMO, Dynamizu, model calibration, dynamic simulation, scenario testing, optimisation studies or operational troubleshooting.
• Experience developing services around digital treatment design, process optimisation, operational intelligence, nutrient removal, sludge/bioresources, water reuse, energy/carbon reduction or smart assets.
• Experience leading process technical governance, communities of practice, design standards, QA frameworks or delivery improvement initiatives.
• Experience building teams during growth phases, including skills mapping, capability planning and creation of 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 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.