Lead Process Engineer - Associate Director - Water Sector

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Company Description

Job Title: Lead Process Engineer

Division: Water

Location: London

About Us

Ayesa is a global engineering consultancy with over 13,000 employees, where our UK & Ireland business combines international strength with the agility and autonomy of an SME.

With a presence in 40 countries, Ayesa has built a strong international reputation across a diverse range of engineering disciplines. Our expertise includes water and flood infrastructure, transportation, marine and coastal engineering, geoscience, environmental services, energy, and building structures.

Our UK & Ireland teams deliver technically challenging, varied projects that develop broad expertise without confining people to narrow roles - offering the opportunity to make a meaningful local impact while benefiting from the stability, knowledge, and career opportunities of a well-established global organisation.

Position

The Opportunity

We're looking for a Lead Process Engineer - Associate Director to join our Water Infrastructure Team within the UK, taking a key technical and leadership role in the design, coordination, and delivery of process engineering solutions across water, wastewater, sludge treatment centres, biological and utilities projects. You'll help shape strategies, mentor engineers, and drive excellence from concept through to commissioning.

What You'll Be Doing

• Lead process design for treatment plants, pumping stations, and utility systems.
• Define process schemes, develop mass balance and hydraulic profiles and calculations, and specify treatment equipment.
• Ensure compliance with UK regulations and client requirements (DWI, EA, Ofwat, BSI, WIS, IGN, SuDs, etc.).
• Lead technical reviews, challenge assumptions, and ensure design integrity and performance.
• Coordinate across civil, mechanical, electrical, and control disciplines in a multidisciplinary environment.
• Develop and manage PFDs, P&IDs, design reports, and technical specifications.
• Support BIM and digital design integration within process design workflows.
• Present and facilitate HAZOP, HAZID, and SIL studies.
• Lead or support design and build (D&B) projects in collaboration with utilities and delivery partners.
• Oversee scope, schedule, and budget control to ensure efficient delivery.
• Provide technical leadership and mentorship to engineers and graduates.
• Engage directly with clients to shape solutions and lead proposals or bids.
• Promote innovation, sustainability, and digital best practices within the team.

Key Accountabilities

• Deliver robust, efficient, and compliant process design solutions.
• Collaborate effectively within multidisciplinary teams.
• Manage workload, priorities, and project performance.
• Ensure adherence to Ayesa's Integrated Management System (IMS).
• Represent Ayesa professionally, building strong client relationships.

Requirements

What You Bring

Experience & Qualifications

• 10+ years' experience in water, wastewater, or industrial effluent treatment design.
• Chartered Engineer (CEng) status or equivalent.
• Degree in Chemical, Process, or Environmental Engineering (Master's desirable).

Skills & Knowledge

• Deep understanding of water and wastewater treatment process principles.
• Proven ability to develop complete process solutions from concept to detailed design.
• Experience with UK and Ireland industry standards and specifications.
• Skilled in developing PFDs, P&IDs, and conducting process calculations.
• Experience leading HAZOP/HAZID workshops and supporting commissioning activities.
• Strong leadership, coordination, and client engagement skills.
• Familiarity with BIM, digital design, and sustainable engineering practices.

Other information

What's In It for You

• Competitive Salary: We offer a competitive salary package to attract and retain top talent in the industry.
• Flexible Working: Enjoy flexible working hours and hybrid working, allowing you to achieve a better work-life balance.
• Employer Pension Match Scheme: We offer a pension match scheme to help you secure your financial future.
• Income Protection: Receive support in safeguarding your income in the event of illness or injury.
• Life Assurance: Gain peace of mind with life assurance coverage.
• Training and Development Programme: Access a range of training and development opportunities to enhance your skills and advance your career.
• Family & Well-Being Support: Benefit from our Enhanced Maternity & Paternity Benefits and our confidential support services to address personal or professional challenges, included in our Employee Assistance Programme.
• Sports and Social: Engage in our vibrant sports and social activities to foster a sense of community and well-being among our team members.
• Increased Annual Leave: 25 days' annual leave plus statutory bank holidays, enjoy increased annual leave entitlements based on years of service.
• Recognition Awards: Receive recognition for your contributions through our awards program, celebrating achievements and excellence.

We're Inclusive by Design

Ayesa is proud to be an equal opportunity employer. We value and celebrate diversity in all its forms, including but not limited to age, disability, gender identity, race, religion or belief, sex, sexual orientation, and socio-economic background or neurodiversity. We believe that a diverse workforce fosters innovation and stronger outcomes. We are committed to inclusive hiring practices, providing reasonable adjustments for applicants and employees with disabilities, and ensuring equal access to opportunities for learning, development, and progression across our organisation.