Senior Process Engineer - Water / Wastewater

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 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.

Responsibilities

Lead defined process design tasks or work packages across feasibility, optioneering, concept, outline and detailed design.; Prepare, check and coordinate process deliverables including calculations, mass balances, PFDs, P&IDs, basis of design reports, specifications, datasheets and schedules.; Take ownership of assigned process packages, managing technical quality, interfaces, scope, budget, programme and change.; Lead site surveys, data reviews, process capacity assessments and technical discussions with clients, operators, suppliers and contractors.; Develop treatment process options and support selection of efficient, robust and operable solutions.; Coordinate process interfaces with Mechanical, EICA, civil/structural, architectural, MEP and construction teams.; Support HAZOP, SWIFT, DSEAR, HAC/HAP, CDM/safety-by-design reviews, commissioning strategies and performance testing.; Apply process modelling, simulation, spreadsheets and data analysis to improve design quality and support evidence-based decisions.; Review supplier/contractor submissions, respond to technical queries and support construction, commissioning and handover where required.; Mentor Engineers and Graduates and contribute to process standards, templates and delivery improvements.

Requirements

BEng/MEng or equivalent in Chemical Engineering, Process Engineering or closely related discipline.; Chartered Engineer status, or significant CEng-level experience while actively progressing towards chartership.; Typically 6+ years’ relevant process design experience.; Background must be from water, wastewater and/or biosolids/sludge treatment design.; Proven ability to deliver process design packages within multidisciplinary projects.; Strong practical experience preparing and checking process calculations, mass balances, PFDs, P&IDs, basis of design reports, specifications and technical documentation.; Working knowledge of UK water industry standards, CDM 2015, process safety, safety-by-design and relevant regulatory requirements.; Experience using process modelling/simulation, advanced spreadsheets or data-led design methods to support treatment design.; Good commercial awareness and ability to deliver to agreed scope, budget and programme.; Strong communication skills, including ability to lead technical discussions and present recommendations clearly.; Right to work in the UK to be considered for this position.

Nice to have

Practical experience using BioWin, SUMO, Dynamizu or similar water/wastewater process simulation packages.; Experience with AMP8, WINEP, SROs, D&B, framework, alliance or major capital delivery environments.; Experience in nutrient removal, sludge/bioresources, water reuse, process optimisation, chemical dosing, energy recovery, advanced treatment or low-carbon design.; Experience supporting commissioning, performance testing, HAZOPs, SWIFT reviews or technical assurance reviews.; Experience mentoring junior staff and improving process workflows, templates or technical standards.

Benefits

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.; 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.