Senior Wastewater Network Modeller

Location/s: Bristol, Cardiff, Reading, Newcastle, Manchester, Brighton, Edinburgh, Derby, Leeds & London; UK

Recruiter contact: Nicola Coyle

Mott Mac Donald is a global engineering, management and development consultancy with over 20,000 employees across more than 50 countries and 140+ offices. We work across a range of global industries, delivering projects that define our future and positively impact communities. With many opportunities to collaborate, learn and grow, the possibilities for excellence are as varied as every individual.

The Water Utilities Division is Mott Mac Donald’s centre of excellence for responding to the UK and Ireland’s water and wastewater challenges. We work at the forefront of ensuring safe water supplies for future generations, preventing urban flooding and improving the health of our rivers and coastal environments. Our multidisciplinary teams deliver advisory services, feasibility studies, and detailed design throughout the full project life cycle.

We are looking for a Senior Wastewater Network Modeller to join our team of network modellers, engineers and project managers, delivering projects across the UK. The role offers the opportunity to progress a career, mentor others and contribute to internal innovation, external conferences, strategic direction and business development.

• Deliver wastewater infrastructure projects of varying sizes
• Collaborate closely with clients to ensure they understand model outputs and processes
• Mentor and train graduate modellers and support their professional development
• Specify and manage flow surveys
• Lead check or technical role on model build, verification and optioneering projects
• Perform complex modelling tasks where required
• Contribute to and check technical reports and presentations
• Develop technical calculation outputs when needed
• Opportunity to project manage infrastructure projects, including programme, commercial performance and technical excellence

Essential

• Team player with the ability to develop relationships at all levels
• Collaborative experience with clients as delivery lead, planning and delivering wastewater modelling projects of varying sizes
• Strong communication skills
• Strong working knowledge of Info Works ICM and GIS packages
• Chartered with a relevant professional institution (e.g. ICE or CIWEM)
• Excellent spreadsheet data‑analysis skills (e.g. MS Excel pivot tables or PowerBI)
• Programming skills in VBA or Python considered advantageous
• Project Management experience and skills advantageous but not required

Mott Mac Donald Ltd. are not currently offering sponsorship to candidates under the Skilled Worker visa route in the UK. We continue to welcome applications from candidates who are eligible for alternative immigration routes that do not require sponsorship.

We offer a hybrid working policy that embraces well‑being, flexibility and trust, allowing teams and managers to choose the most effective working style.

We promote fair employment procedures and practices, encouraging individual expression and ensuring an inclusive environment where everyone feels they can contribute.

If you are disabled or need support during the recruitment process, please contact reaso and we will discuss how we can assist you.

Financial wellbeing

• Pension match between 4.5% and 7%
• Life assurance up to 4× basic salary, with option to increase to 6×
• Income protection scheme with financial benefit, absence and return‑to‑work support
• Flexible benefits, including enhanced life assurance, critical illness insurance, payroll saving and will writing
• Annual bonus schemes reflecting business success

Employee Ownership

• No external investors—shared success culture
• Employees have a stake and a voice in business performance bonuses
• Stake grows with long‑term impact and contribution
• Direct pathways toward ownership for senior roles

Health and wellbeing

• Private medical insurance for all UK colleagues
• Health cash plan for everyday health costs
• Access to Peppy, providing support from menopause experts
• We…