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Mott MacDonald • Madrid, ES; Seville, SE, ES

Senior Wastewater Modeller

Employment type:  Full time
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Job Description

Mott MacDonald

Position location: Madrid, Seville
Recruiter contact: Maria Marchidan

We’re a global engineering, management, and development consultancy.
Our purpose is to improve society by considering social outcomes in everything we do, relentlessly focusing on excellence and digital innovation, transforming our clients’ businesses, our communities and employee opportunities.

A fundamental part of this is respecting each person’s differences and striving to meet their needs.

Our values: Progress, Respect, Integrity, Drive, Excellence.

About the business unit:

Do you want to work for a company whose purpose is to improve society by considering social outcomes, and to transform businesses, communities, and opportunities for its employees?

Mott MacDonald is a market leader in the UK water sector, being a key supplier to major water companies and delivering a wide variety of engineering and advisory projects in support to the challenges faced by the sector. Working for a company like ours, with technical excellence at our core, offers you access to industry recognised experts in a variety of disciplines and the support and opportunities you are after for your career progression. Our business is wholly employee- owned. Being independent means that we can choose our own direction and focus on what we believe is important for our clients, our people and those communities which we work and live in. We are a family of people excited to solve complex challenges that have a positive impact on the world, and we are always looking for like-minded people to join our team.

Our Water Consultancy Division has ambitious growth plans in line with AMP8 (2025-2030) investment needs and we are proud of our strong reputation in the industry which is allowing us to expand our business. We cover all phases of the project lifecycle from feasibility studies through detailed design, construction support, and commissioning to handover. We also provide specialist technical support to colleagues across our global business, offering fantastic opportunities to get involved in diverse and technically complex work.

The scale of investment required in AMP8 is a significant challenge but also a major opportunity to provide a long-lasting legacy to our clients and their regions. It also requires new more efficient ways of delivering our services and for the successful candidate to demonstrate their ability to identify and implement innovations that maintain delivery to programme and commercial targets.

Overview of the role:

We have an exciting opportunity for a Senior Wastewater Hydraulic Modeller to join our team of innovative and motivated network modellers, engineers and project managers, delivering projects across the UK and Europe. We are looking for a driven, experienced individual who wants to progress their career, with a desire to evolve within Mott MacDonald, and to mentor and develop others. As a Senior Modeller, you’ll provide key technical inputs on a diverse range of UK wastewater infrastructure projects, from feasibility through to detailed design. Our senior modellers are a key part of our modelling community and have the opportunity to contribute to internal innovation sprints, involved in external conferences, drive the direction of our sub-sector at a strategic level and contribute to business development.

You’ll be responsible for:

  • Delivering wastewater infrastructure projects of varying sizes.
  • Collaborating closely with our clients to ensure they understand model outputs and processes.
  • Mentoring and training of graduate modellers and providing guidance to support their professional development.
  • Specification and management of flow surveys.
  • Undertaking a technical lead role of model build and verification projects.
  • Contributing and checking technical reports and presentations.
  • Developing technical calculation outputs when needed.
  • Opportunity to project manage infrastructure projects. This will involve being responsible for programme, commercial performance and technical excellence.
  • Mott MacDonald offers a highly innovative and collaborative environment within which to further develop your career. We can offer development in technical, management or client-facing directions, or a combination thereof - you will have control of your own career path and great prospects for career progression as the business continues to grow

Candidate specification:

To be considered for this role you will require:

  • Ability to be a team player and develop relationships at all levels.
  • Working collaboratively with clients as delivery lead, planning and delivering wastewater modelling projects of varying sizes.
  • Strong communication skills.
  • Qualified candidates should have a strong working knowledge of InfoWorks ICM as well GIS packages
  • Chartered with a relevant professional institution (i.e. ICE or CIWEM).
  • Excellent skills in spreadsheet data analysis (i.e: using MS Excel pivot tables or PowerBI).
  • Programming skills in languages such as VBA or Python would be advantageous.
  • Project Management experience and skills would be advantageous but not required

We are actively recruiting a diverse workforce that is reflective of the communities we serve. We recognise that differences in ability, skills and experience are a strength and encourage applications from people of all backgrounds.

Equality, diversity, and inclusion

We put equality, diversity, and inclusion at the heart of our business, seeking to promote fair employment procedures and practices to ensure equal opportunities for all. We encourage individual expression in our workplace and are committed to creating an inclusive environment where everyone feels they can contribute.

Accessibility

We want you to perform your best at every stage in the recruitment process. If you are disabled or need any support to enable you to apply or attend an interview, please contact us at reasonable.adjustments@mottmac.com and we will talk to you about how we can support you.

Agile working

Happy to talk Flexible Working and how we can support your responsibilities beyond the workplace.

We offer some fantastic benefits including:

  • Holiday entitlement
  • Life assurance
  • Professional membership subscription
  • Private medical insurance
  • Pension scheme
  • Agile/flexible working – because life isn’t 9-5
  • Annual bonus scheme
  • Flexible benefits that suit you, including restaurant voucher, transport card or day care voucher.
  • Wellbeing support including access to an independent Employer Assistance Scheme, wellbeing champions and access to learning and support resources
  • Access to our Advanced Employee Networks which support our LGBTQ+, gender, race and ethnicity, disability and parents/carers communities
  • The opportunity to make a difference; learn more about our social outcomes

Apply now, or for more information about our application process, click here.

Company benefits

Open to part-time employees
Open to part time work for some roles
Enhanced maternity leave – 26 weeks full pay
Adoption leave – 26 weeks full pay
Shared parental leave – We match up to 24 weeks full pay
Enhanced paternity leave – 2 weeks
Private GP service – Private Medical care for all UK staff
Life insurance – 4 x salary
Enhanced pension match/contribution – matched up to 7%
Buddy scheme
Enhanced sick pay
Dental coverage
Compassionate leave
Health assessment
Eye Care Support – Eyecare vouchers
Life assurance
Carer’s leave – up to 5 days, two of which are paid
Pregnancy loss leave
Salary sacrifice
Buy or sell annual leave
Accrued annual leave
Religious celebration leave
Tax-free childcare
Theme park discounts
On-site yoga classes
Cycle to work scheme
Faith rooms
Annual pay rises
Annual bonus
Income protection
Employee discounts
Professional subscriptions – We pay for your primary professional annual subscription
Lunch and learns
Employee assistance programme
L&D budget
Teambuilding days
Travel loan
Returnship
Mentoring
In house training
Study support
Learning platform
Further education support

Working at Mott MacDonald

Company employees

18,000 worldwide

Gender diversity (male:female)

65:35

Currently hiring in

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Awards & Accreditations

2nd – Career Progression

2nd – Career Progression

Flexa awards 2025
3rd – Family Friendly

3rd – Family Friendly

Flexa awards 2025
Work-Life Balance

Work-Life Balance

Flexa awards 2025
Flexible

Flexible

Flexa awards 2025
Culture

Culture

Flexa awards 2025

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