Senior Fullstack Engineer (Node JS, React, Typescript)
Salary: Competitive Plus Benefits
Location: Holborn Store Support Centre, London, EC1N 2HT
Contract type: Permanent
Business area: Sainsbury's Tech
Closing date: 28 February 2025
Requisition ID: 292202
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.
We’re proud to work with one of the most exciting data sets in the UK. Our massive datasets, comprising billions of data points from diverse sources across the retail landscape, drive machine learning models that enhance personalisation and product recommendations. This work directly impacts millions of customers daily. In our inclusive, agile environment, you’ll have the freedom to explore, experiment, and solve real-world challenges—seeing your creations in the hands of millions across the UK.
Why join us?
You’ll be the lead engineer 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, leading the design, implementation and delivery of complex initiatives, and providing inspiration, guidance and mentorship to the members of your team.
About the role
· Build UI components and, sometimes, whole user journeys from Figma designs, in React.
· Write Typescript on the application’s front-end, back-end and in-between: full stack
· Style UIs 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.
· Collaboratively contribute to the design and support of services and internal frameworks
· Lead the 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.
· Drive the full technical lifestyle of complex initiatives from technical design, implementation and delivery
· Actively participate in the support rota, providing timely assistance to ensure system reliability.
· Foster team growth and development by providing support, guidance and mentorship to teammates, both through collaborative efforts, direct pair programming sessions and PR reviews
More about you
To be considered for this role, you should possess extensive industrial experience and have a strong passion for working with:
· Writing, maintaining and reviewing TypeScript code at production
· Modern React with hooks
· Serverless infrastructure and AWS eco system
· Testing frameworks for unit and component tests (e.g. Vitest, RTL, Jest) and End to End testing (e.g. Cypress, Playwright)
· TDD
· Modern CSS styling: Tailwind, CSS Modules, style-dictionary and design tokens
· React state management solutions (e.g. Redux, React Query)
· Authoring and consuming REST APIs
· GraphQL
· SQL and NoSQL databases
· Continuous learning, especially in emerging tech
· Delivering through others as well as yourself
· Trunk-based development and CI/CD pipelines using GitHub actions
· Proven experience in software design and implementation, security, cloud infrastructure & monitoring CI/CD
· Customer-focused, owning the entire SDLC, and embodying DevOps principles.
· Mentorship, empowering and growing engineers
While not mandatory, having the following qualifications can give you a competitive edge
· Proficiency in AWS (AWS Certification is a plus)
· Competence in Terraform
· Exposure to event-driven architectures
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: 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.
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.
Please see www.sainsburys.jobs for a range of our benefits (note, length of service and eligibility criteria may apply).