Senior Full-Stack .Net Engineer

About the Role

We’re looking for a talented Senior Full stack .NET Engineer to help design, build and deliver high‑performing technology that improves customer experience, drives business efficiency and reduces operating costs.

You’ll help shape technical direction and mentor others whilst championing engineering excellence and be a valued contributor to our broader engineering community.

You’ll bring curiosity, analytical thinking and a willingness to challenge how things are done — always looking for ways to improve engineering practices within your team.

What You’ll Do

• Design and build large‑scale, high‑performance services using the latest technologies and engineering standards.
• Work with technologies such as React.js, SQL, MongoDB, Kubernetes, Docker, serverless functions and event‑driven architecture.
• Implement and enhance cloud-based solutions across AWS and Google Cloud Platform.
• Help lead the technical roadmap, shaping the long‑term architecture and engineering strategy.
• Share knowledge, contribute to best practices and enable continuous improvement within the engineering community.
• Lead the design and support of internal frameworks that enhance engineering capabilities across the Sainsbury’s Group.
• Engineer across the entire product lifecycle—from inception through to decommissioning.
• Consider cost, scalability, and operational support implications in your technical decision‑making.

Who You Are

You’re a proactive, driven engineer who is passionate about modern engineering practices, cloud technology and delivering high‑quality solutions. You promote agile ways of working and enjoy solving complex problems in a collaborative environment.

Essential Criteria

• Strong experience in .NET development and associated engineering principles.
• Proficiency with relational and non‑relational databases (e.g., SQL, MongoDB).
• Experience working with cloud platforms (AWS and/or Google Cloud Platform).
• Knowledge of React.js/Typescript and modern frontend development standards.
• Experience with Docker, Kubernetes, and container orchestration.
• Understanding of serverless functions and event‑driven architecture.
• Solid understanding of software design, security principles, and DevSecOps practices.
• Hands-on experience with CI/CD pipelines and infrastructure-as-code.
• Curiosity for emerging technologies and a commitment to continuous learning.
• Excellent problem‑solving, communication, and mentoring skills.
• Empathy and the ability to support, coach, and empower colleagues to deliver their best.
• Self‑driven with a desire to improve processes, teams, and engineering practices.

Ways of Working

• Strong advocate for agile/lean delivery methodologies.
• Ability to collaborate effectively across multidisciplinary teams.
• Self-driven mindset with a passion for continuous learning and innovation.

What’s in It for You

• Colleague discount across Sainsbury’s, Argos and Habitat
• Competitive holiday allowance
• Bonus scheme
• Pension plan
• Flexible / smarter working policy
• Access to a wide range of discounts (gyms, restaurants, retail and more)

We’d all like amazing work to do, and real work-life balance. That’s waiting for you at Sainsbury’s. Think about the scale it takes to feed the nation. The level of data, transactions and variety involved. Then you’ll realise this is a modern software engineering environment, because it has to be. We’ve made significant investment in the standards and principles that shape how we work. We iterate, learn, experiment and champion ways of working such as Agile, Scrum and XP. So you can look forward to exciting opportunities across everything from AI to reusable tech.We are committed to being a truly inclusive retailer, so you’ll be welcomed whoever you are and wherever you work. Around here, there’s always the chance to try something new - whether that’s as part of an evolving team or somewhere else across the business - and we take development seriously and promise to support you. We also recognise and celebrate colleagues when they go the extra mile and, where possible, offer flexible working. When you join our team, we’ll also offer you an amazing range of benefits. Here are some of them:

Starting off with colleague discount, you'll be able to get 10% off at Sainsbury's, Argos, TU and Habitat after 4 weeks. This increases to 15% off at Sainsbury’s every Friday and Saturday and 15% off at Argos every pay day. We've also got you covered for your future with our pensions scheme and life cover. You'll also be able to share in our success as you may be eligible for a performance-related bonus of up to 20% of salary, depending on how we perform.

Your wellbeing is important to us too. You'll receive an annual holiday allowance, and you can buy additional holiday. We also offer other benefits that will help your money go further such as season ticket loans, interest free car loan of up to £10k, cycle to work scheme, health cash plans, pay advance (where you can access some of your pay before pay day) as well access to a great range of discounts from hundreds of other retailers. And if you ever need it there is also an Employee Assistance Programme, you will also be eligible for private healthcare too.

Moments that matter are as important to us as they are to you which is why we give up to 26 weeks’ pay for maternity or adoption leave and up to 4 weeks’ pay for paternity leave.

Please see www.sainsburys.jobs for a range of our benefits (note, length of service and eligibility criteria may apply).