Job Description Start here. Grow here. “Are you ready to join a team of wastewater modellers and shape the future of the Water Industry?” Join our dynamic and multidisciplinary Water Team as a Principal Wastewater Modeller. You can be based in one of our UK or Ireland offices whilst also taking advantage of our flexible hybrid working model. You will be a key player in delivering impactful water projects across the UK and internationally. We enable the development of significant flood alleviation schemes, pollution reduction, and infrastructure projects, and this variety will be fundamental to your continuous professional growth. A unique aspect of our approach is that our modelling team is fully integrated with the wider project teams, ensuring that our modellers work closely alongside experts in other areas to develop comprehensive solutions. As an industry leader in Blue-Green infrastructure and nature-based solutions, we work with both public and private sector clients such as Severn Trent, Anglian Water, Northern Ireland Water, the Environment Agency, LLFAs and other infrastructure providers. We deliver Flood Risk Assessments, Drainage Strategies, Outline Business Cases, hydraulic models, and detailed designs. We shape industry standards by advising and developing guidance that benchmarks best practices, keeping AECOM at the forefront of the water industry. This position offers an exceptional opportunity to support a talented, diverse team committed to innovation, collaboration, and efficiency. Here’s what you’ll do: Lead the development, calibration and verification of wastewater network models (e.g., InfoWorks ICM or similar platforms). Provide technical oversight and quality assurance across multiple projects, operating under general direction while guiding wider project teams. Undertake and oversee technical and administrative tasks of limited to moderate complexity related to hydrology and groundwater investigations where required to inform wastewater modelling studies. Deliver assignments that may span the broader field of hydrology and related technical disciplines, working to defined project terms with appropriate professional review. Analyse complex datasets and modelling outputs, preparing clear, high-quality technical reports and client deliverables. Monitor and interpret data to assess the impacts of upstream activities on wastewater systems and the wider environment, ensuring compliance with relevant permits and regulatory conditions. Act as technical lead on major frameworks and modelling programmes, supporting strategic planning, storm overflow reduction, and network resilience initiatives. Mentor and develop junior team members and contribute to bids and business development activities. If you're passionate about innovation and turning bold ideas into reality, AECOM welcomes you. Join our team, where we don't just construct infrastructure but also uplift communities and enhance lives. Why not give our AECOM Water page on LinkedIn a follow to stay updated on the impactful projects we're working on and see firsthand the difference we're making in the industry! Come grow with us. Become part of our dynamic Water business, which boasts around 700 experts across the UK & Ireland. Collaborate with top-tier engineers and consultants to deliver a variety of captivating projects, from small initiatives to large-scale ventures, all the way from concept to completion. At AECOM, you’ll thrive in an inclusive and forward-thinking environment where your contributions are valued - and let's not forget about the perks! You'll enjoy a range of core and personalised benefits designed to support your future and well-being, customised to fit your lifestyle. Take advantage of career development opportunities, technical practice networks, AECOM University, volunteering days and our flexible hybrid working model to ensure a work-life balance that suits your lifestyle. We recognise that everyone’s circumstances are different, so we’re happy to discuss part-time or flexible working arrangements that suit you. Why Join Us: Be part of a dynamic team that tackles challenging and impactful water projects. Work alongside industry-leading professionals and thought leaders. Engage in a collaborative and inclusive work environment. Access to continuous learning and development opportunities. Competitive salary and comprehensive benefits package. Enjoy the flexibility to work in a way that fits your lifestyle while supporting a healthy work–life balance.