Principal Process Engineer - Water / Wastewater

Principal Process Engineer - Water / Wastewater

Mid-Senior Level

Project Management - Engineering

About Us

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.

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

• Lead process design delivery on multidisciplinary water/wastewater treatment projects across the full design lifecycle.
• Act as process technical lead on projects, owning design strategy, treatment process selection, key decisions, interfaces, risks and quality of deliverables.
• Review and approve process calculations, mass balances, PFDs, P&IDs, basis of design reports, specifications, technical notes, models and supplier/contractor submissions.
• Lead process modelling and simulation activities using tools such as BioWin, SUMO, Dynamizu or equivalent packages.
• Lead optioneering, process capacity assessments, value engineering, design reviews, HAZOP/SWIFT, commissioning strategy and performance testing input.
• Drive multidisciplinary coordination across Mechanical, EICA, civil/structural, architectural, MEP, construction, commissioning and operations teams.
• Promote lean and digitally enabled delivery through standardised tools, process models, automation, data analysis 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 process capability.

What do we need from you

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 8–10+ years' relevant process design experience.
• Background must be from water, wastewater and/or biosolids/sludge treatment design.
• Proven ability to act as process discipline lead or senior technical lead on multidisciplinary projects.
• Strong technical expertise in water/wastewater treatment process design, including process selection, mass balance, process capacity, PFDs, P&IDs and design basis development.
• Practical experience using process modelling/simulation packages such as BioWin, SUMO, Dynamizu or equivalent.
• Strong understanding of UK water industry standards, CDM 2015, process safety, safety-by-design, regulatory drivers and common delivery models.
• Confident client-facing communicator with experience leading workshops, technical reviews and design discussions.
• Experience mentoring or managing engineers and supporting technical capability development.

Desirable Skills / Knowledge

• Deep experience in wastewater treatment, clean water treatment, sludge/bioresources, nutrient removal, water reuse/recycling, process optimisation, chemical dosing, energy recovery or low-carbon design.
• Experience delivering AMP8, WINEP, SRO, D&B, framework, alliance or contractor-led projects.
• Advanced capability in BioWin, SUMO, Dynamizu, process model calibration, scenario testing, dynamic simulation or operational optimisation.
• Experience developing process design standards, calculation tools, modelling workflows, QA processes or reusable digital templates.
• Experience contributing to recruitment, resource planning, bid writing, technical proposals, client presentations or new service development.
• Please note that you must have the right to work in the UK to be considered for this position.

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.