Fullstack Engineer

Sainsbury's Supermarkets Ltd; City Of London; On-site; GBP 80,000 - 100,000; Full time

Job summary

A leading retail company is looking for a Full Stack Engineer to join their tech team in London. You will work on Ad-tech projects, utilizing React and TypeScript to develop UI components, and contributing to complex services using Node.JS and databases. The role offers a dynamic environment with opportunities for continuous learning in a modern software engineering context.

Benefits

Colleague discount across brands

Pension plan

Special offers on gym memberships and other discounts

Performance-related bonus of up to 10% of salary

Annual holiday allowance

Qualifications

• Experience with modern development practices such as CI/CD.
• Proficiency in both SQL and NoSQL databases.
• Ability to develop large-scale services and APIs.

Responsibilities

• Build UI components from Figma designs in React.
• Collaboratively contribute to the design of services.
• Troubleshoot and resolve issues in production applications.

Skills

React

TypeScript

Node.JS

Tailwind CSS

MongoDB

PostgreSQL

GitHub Actions

Cypress

Job description

Salary: Competitive Plus Benefits
Location: London Store Support Centre, London, EC1M 6HA
Contract type: Permanent
Business area: Sainsbury's Tech
Closing date: 14 November 2025
Requisition ID: 400029996

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 for us to feed the nation. The level of data, transactions and variety it involves. Then you’ll realise that ours is a modern software engineering environment because it has to be. We’ve made serious investment into a Tech Academy and into setting standards and principles. We iterate, learn, experiment and push ways of working such as Agile, Scrum and XP. So you can look forward to awesome opportunities in everything from AI to reusable tech.

Full Stack Engineer | Sainsbury's Tech

You’ll be part of one of our Engineering squads working on Ad-tech, interpreting and following architectural and engineering principles, operating frameworks, and new and improved technology and solutions. With your technical craft, curiosity and experimentation, you’ll use judgement to apply specific techniques to deliver focused outcomes that support our customers.

We use a variety of tech here and you need to be willing to pick up new tools and techniques. We’d also like you to be yourself - analytical, curious and unafraid to challenge the status quo.You’ll constantly strive to improve the way things are done in your team, contributing as a progressive member of the engineering community.

About the role

• Build UI components and, sometimes, whole user routes from Figma designs, in React.
• Write Typescript on the website’s front-end, back-end and in-between: full stack.
• CSS-style the UI’s using Tailwind and CSS Modules, while harnessing design tokens.
• Actively contribute to developing large-scale services for optimal performance, utilising technologies like Node.JS, Typescript, Mongo DB, Postgres, SQL, AWS Lambda, GraphQL and Serverless framework. This extends to microservices and event-driven architecture.
• Be proficient in unit testing (TDD), end-to-end testing and best practices.
• Collaboratively contribute to the design and support of services and internal frameworks.
• Actively participate in research, scoping, and planning activities led by engineering and product managers for the development of new domain and platform capabilities.
• Troubleshoot and resolve issues in production web applications, databases, services, and related components.
• Actively participate in the support rota, providing timely assistance to ensure system reliability.
• Foster team growth and development by providing support and mentorship to teammates, both through collaborative efforts, direct pair programming sessions and PR reviews.
• Familiar with trunk-based development and CI/CD pipelines using GitHub actions.
• Well-versed writing, maintaining and reviewing TypeScript code at production
• Serverless infrastructure and AWS eco system
• Modern React with hooks, experience writing unit tests (Vitest, RTL) for components
• Modern CSS styling: Tailwind, CSS Modules, style-dictionary and design tokens
• Redux experience is valued but not required, we use React Query
• Writing and maintaining E2E on Cypress (but Playwright experience will be counted too)
• Extensive experience in developing and utilising enterprise APIs
• Proficiency in SQL and NoSQL databases
• Customer-focused, owning the entire SDLC, and embodying DevOps principles
• Proven experience in software design and implementation, security, cloud infrastructure & monitoring CI/CD
• Enthusiastic about continuous learning, especially in emerging tech

What I need to show

• A positive approach to change
• A solution-focused mindset with creativity and adaptability
• Good communication skills and the ability to navigate complex corporate governance environments

As well as lots of on-the-job training and endless opportunities, you'll get:

• Colleague discount across our multi-brands - Sainsbury's, Argos, Tu and Habitat
• Pension plan
• Special offers on gym memberships, restaurants, holidays, retail vouchers and more

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 10% 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, 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.

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).