Job Description

Tesco UK • Welwyn Garden City • In office / On Location • Full-Time • Permanent • Working hours 36 • Apply by 29-Jan-2027

About the role

At Tesco, we're using data and AI to create better experiences for our customers and colleagues every day. As a Software Development Engineer III (Data & AI), you'll play a key role in shaping and delivering the next generation of AI-powered products across the business.

Joining our Analytics Engineering team, you'll design, build and scale innovative solutions that combine data, software engineering and Generative AI to solve complex business challenges. Working closely with product, engineering, data science and business teams, you'll take ideas from discovery through to production, creating intelligent experiences that drive real impact at one of the UK's largest retailers.

This is an exciting opportunity for an experienced engineer who enjoys solving complex problems, building modern applications and helping shape engineering best practice in a fast-moving AI environment.

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 (12 months service required at the qualifying date) 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.

The above information is a shortened summary, refer to our policies for full details

You will be responsible for

You will be responsible for

• Designing, building and operating production-grade Data & AI products that deliver measurable business value.
• Developing GenAI-powered applications, including LLM-based solutions, copilots and agentic workflows that enhance decision making and automation.
• Working closely with Product Managers, Designers, Data Scientists and Engineers to turn business challenges into scalable technical solutions.
• Building and integrating APIs, backend services and user-facing applications to create seamless end-to-end experiences.
• Developing intuitive web applications using React, TypeScript, HTML and CSS.
• Creating reusable AI capabilities, frameworks and engineering patterns that enable the safe and consistent adoption of GenAI across multiple teams.
• Supporting live products, troubleshooting complex issues and driving continuous improvements in reliability, performance and user experience.
• Championing engineering excellence through testing, CI/CD, observability, security and modern software development practices.
• Providing technical leadership through mentoring, design reviews and knowledge sharing.

You will need

Significant experience delivering and supporting production software systems in a senior engineering role.Strong backend development experience, preferably using Python or similar technologies.Experience designing and building APIs and distributed applications.Hands-on experience building solutions using Large Language Models (LLMs), AI assistants, copilots or agent-based workflows.Understanding of prompt engineering, evaluation techniques, token optimisation and working with LLMs alongside enterprise data.Experience building modern web applications using React and JavaScript/TypeScript.Strong understanding of HTML, CSS, accessibility and user experience best practices.Experience working across data, backend and frontend technologies within collaborative product teams.Excellent communication and stakeholder management skills, with the ability to explain complex technical concepts to a range of audiences.A passion for building high-quality solutions and continuously improving engineering standards.

About us

You might know us as a supermarket, technology company or even for our award-winning mobile network. Truth is, we’re all of those things, and much more. Our colleagues work with one goal in mind, helping to make every day a little better for our customers, colleagues and communities all over the world. No two customers are the same, neither are our colleagues.

At Tesco, we champion a balance that lets you thrive both in and out of work. Spend 60% of your week collaborating with colleagues at our office locations or local sites and the rest remotely. Whether you're just kicking off your career, juggling passions, or navigating big life events, we're here to support you. We always welcome a conversation about flexible working, so talk to us throughout your application about how we can support.

We're proud to be an accredited Disability Confident Leader, where everyone’s welcome. That’s why we commit to providing a fully inclusive and accessible recruitment process. If you need support with your application, click here  for more information. And if you're interested in joining our team but don't tick every box, don't let that hold you back from applying.

When you join us in this role, you'll be employed by Tesco Stores Limited, the Tesco legal entity responsible for your employment.