Data Scientist

As a Data Scientist, you’ll join our dynamic Business Performance & Insights team, working alongside talented data analysts, engineers, and subject matter experts. You’ll deliver high-impact machine learning models and analytics solutions that directly influence business strategy and service performance.

This is more than a technical role—you’ll be a strategic partner, using your expertise to uncover insights, solve complex problems, and drive innovation across all areas of our business.

About us

Affinity Water is the UKs largest water-only supplier, providing sustainable, high-quality water to 3.85million customers across the Southeast of England. We are on a mission to redefine the way water companies connect with their customers and communities, and to make better use of water and safeguard the local environment now and in the future.

We’re on a journey to become a truly data-driven organisation. With data at the heart of how we serve our customers and drive performance, we are building a culture of innovation and insight-led decision-making across the business.

Key Responsibilities

• Design and develop advanced analytics and machine learning models to solve real-world business challenges.
• Work across departments to identify opportunities where data science can deliver measurable value.
• Create powerful visualisations and present findings to technical and non-technical stakeholders.
• Build, deploy, and maintain robust data pipelines and production-grade models (MLOps).
• Champion ethical data practices, governance, and high-quality documentation.
• Stay up to date with AI and data science innovations, bringing cutting-edge thinking into the business.

Experience required

• A degree in Data Science, Computer Science, Mathematics, or a related field.
• 5+ years’ experience in data science, with proven success delivering end-to-end projects.
• Proficiency in Python, R, SQL, and machine learning frameworks (e.g., TensorFlow, PyTorch, Scikit-learn).
• Strong skills in data storytelling, problem-solving, and working with both structured and unstructured data.
• Experience with APIs, cloud platforms (especially AWS), and MLOps practices is a strong advantage.
• A collaborative, curious mindset with excellent communication skills and a passion for innovation.

Benefits include:

• Salary £55,000 dependant on experience
• Hybrid working, two days per week expected in the office in Hatfield
• Annual leave 26 days, plus a celebration day, plus bank holidays, rising with length of service
• A generous pension scheme that doubles the contributions you make, up to a maximum of 12%
• We offer enhanced Maternity, Adoption and Shared Parental Leave. We also have a Carers policy and Menopause policy to help us support our people through different stages of their lives.
• Company bonus scheme
• Access to our Wellbeing Centre with support for looking after your physical and mental health
• Join a diverse and inclusive team where your ideas are valued. Collaborate with experts across various domains to deliver impactful solutions.

You can find out what it’s like to work at Affinity Water through our career site https://www.affinitywatercareers.co.uk/ where our colleagues share their career development stories and you can get a feel for our company culture.

Affinity Water recognises the benefits of greater diversity in our workforce to better reflect the communities we serve. We are committed to building a more inclusive culture where every member of our workforce can thrive.

How to Apply: If you are passionate about data science and eager to contribute to a data-driven future at Affinity Water, we encourage you to apply. Please submit your CV and a cover letter detailing your relevant experience and why you would be a great fit for this role.