Data Scientist (Tesco Mobile) Job at Welwyn Garden City, UK Full Time NEW

Tesco Mobile • Slough or Welwyn Garden City • Permanent • Apply by 30-May-2026

We’re looking for a curious and collaborative Data Scientist to join our Data Science Chapter at Tesco Mobile. This is a hands-on role where you’ll use data and analytical thinking to solve real business problems and improve customer experiences.

You’ll work on a wide range of projects, from personalising customer communications and improving marketing effectiveness, to optimising stock management and reducing customer churn. Your work will directly shape how we make decisions across the business, always keeping our customers at the heart of what you do.

This role can be based from either our Welwyn Garden City, Slough or Manchester Tesco Mobile offices, with occasional travel to other Tesco Mobile or supplier sites. You’ll also attend regular chapter meetings, typically these are held every two weeks and are normally held in Slough or London.

We’re committed to flexibility and welcome conversations about full-time, part-time and job share working

What is in it for you

We’re all about the little helps. That’s why we make sure our Tesco colleague benefits package takes care of you – both in and out of work. Click Here to find out more!

• Annual bonus scheme of up to 20% of base salary
• Holiday starting at 25 days plus a personal day (plus Bank holidays)
• Private medical insurance
• 26 weeks maternity and adoption leave (after 1 years’ service) at full pay, followed by 13 weeks of Statutory Maternity Pay or Statutory Adoption Pay, we also offer 6 weeks fully paid paternity leave
• Free 24/7 virtual GP service, Employee Assistance Programme (EAP) for you and your family, free access to a range of experts to support your mental wellbeing

You will be responsible for

• Build, validate, optimise and manage data science models and data pipelines.
• Own key stages of the data science lifecycle, including deployment to production, testing, CI/CD, documentation and security.
• Analyse complex and diverse datasets using statistical methods to generate insights that improve customer experience and business outcomes.
• Continuously identify opportunities to improve products, processes and performance through innovative data-driven solutions.
• Develop a strong understanding of internal datasets and share knowledge openly with colleagues.
• Promote a positive and inclusive data science culture across the organisation.
• Work collaboratively within product delivery teams and squads to deliver impactful outcomes.
• Define resolution paths for challenges, contribute to project plans and support resource planning.
• Take ownership of your decisions and clearly communicate your approach and rationale.

You will need

• Previous experience working as Data Scientist, with experience of working with customer data, with an understanding of sales and customer behaviour
• Experience with churn, fraud or propensity modelling would be desirable
• Experience delivering end‑to‑end machine learning solutions independently – from building models from scratch in Python, combined with an understanding of the inner workings of the models
• Experience deploying fully in‑house production workflows
• Strong experience in SQL, Python and PySpark, with a solid understanding of good coding practices such as object-oriented programming.
• A strong numerical higher degree is preferable, as well as a solid understanding of mathematics and statistical principles.
• Experience working with databases and combining multiple data sources for modelling and analysis.
• Experience in code optimisation and standard software development practices, including writing tests.
• The ability to translate ambiguous business questions into structured, hypothesis-driven analysis.
• Confidence explaining complex ideas in clear, non-technical language to a wide range of stakeholders.
• Strong listening and communication skills, with a customer-focused approach.
• The confidence to review and constructively challenge work in a positive, inclusive way.
• Familiarity with software engineering best practices (such as version control, OOP, unit testing, CI/CD) and cloud technologies.

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About us

A 50-50 joint venture between Tesco and VMO2 that was established back in 2003, Tesco Mobile has gone from strength to strength as we’ve launched into new services and markets. With more than 5 million customers, we’re the largest mobile virtual network operator in the UK. We’re proud to have an inclusive culture that’s uniquely Tesco Mobile, with a strong sense of community, plus all the benefits of working for one of the shareholders.

We care for human connection and we keep our customers at the heart of everything we do, which is why we’ve embraced the Agile way of working. Agile is more than just a methodology – it’s a liberating journey that puts customers and purpose first. It empowers us to self-organise, collaborate, co-create and rapidly inspect and adapt everything we do – allowing us to respond at pace to our customers’ needs. It encourages variety of thought and enables us to thrive, both individually and collectively.

We are proud to have an inclusive culture at Tesco where everyone truly feels able to be themselves. At Tesco, we not only celebrate diversity, but recognise the value and opportunity it brings. We’re committed to creating a workplace where differences are valued, and make sure that all colleagues are given the same opportunities. We’re proud to have been accredited Disability Confident Leader and we’re committed to providing a fully inclusive and accessible recruitment process. For further information on the accessibility support we can offer, please click here.

We’re a big business and we can offer a range of diverse full-time & part-time working patterns across our many business areas, which means that we can find something that works for you. We work in a more blended pattern – combining office and remote working. Our offices will continue to be where we connect, collaborate and innovate. If you are applying internally, please speak to the Hiring Manager about how this can work for you – Everyone is welcome at Tesco.