Software Development Engineer II (Frontend)

Tesco UK; Welwyn; Hybrid; GBP 50,000 - 70,000; Full time

Job summary

A leading retail company in Welwyn Garden City is seeking an experienced Frontend Software Developer to join their team. The role involves developing scalable frontend systems using JavaScript, TypeScript, and React, while promoting best practices in web development. You will benefit from a flexible hybrid working model and participate in an inclusive work culture. The ideal candidate has over 5 years of commercial experience and a passion for creating accessible web applications.

Benefits

Annual bonus scheme of up to 20% of base salary

Holiday starting at 25 days plus a personal day

Private medical insurance

26 weeks maternity leave at full pay

Free 24/7 virtual GP service

Employee Assistance Programme

Qualifications

• 5+ Years of commercial experience as a Frontend Software Developer.
• Best practices regarding all aspects of web development.
• Strong experience with high-traffic applications.

Responsibilities

• Develop and implement scalable frontend systems.
• Profile and optimize code.
• Translate requirements into tasks & code.
• Write secure and maintainable code

Skills

JavaScript

TypeScript

React

Node.js

Web Accessibility

Tools

Jest

Cypress

Playwright

Enzyme

Mocha

Job description

Tesco UK

Location & Type

• Welwyn Garden City
• Hybrid
• Full‑Time
• Apply by 22‑May‑2025

About the role

At Tesco, we believe in the power of spending more time together, face‑to‑face, than apart. So, during your working week, you can expect to spend 60% of your time in one of our office locations or local sites and the rest remotely. We also recognise that life looks a little different for each of us. Some people are at the start of their careers, some want the freedom to do the things they love. Others are going through life‑changing moments like becoming a carer, nearing retirement, adapting to parenthood, or something else. That's why at Tesco, we always welcome a conversation about flexible working. So, talk to us throughout your application about how we can support.

Benefits

• 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 year’s service) at full pay, followed by 13 weeks of Statutory Maternity Pay or Statutory Adoption Pay, we also offer 4 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

Responsibilities

• Use your in‑depth knowledge of JavaScript, TypeScript, React, Node and the ecosystem of tools to develop and implement scalable frontend systems.
• Profile and optimise code.
• Apply understanding of cohesion and architectural principles to create well‑structured, maintainable software.
• Identify patterns in code and refactor the code towards them where it increases understanding and/or maintainability with minimal guidance.
• Translate requirements into tasks & code.
• Develop high quality code that can lead to rapid delivery, ruthlessly pursuing continuous integration and delivery – CICD.
• Commit code early and often, demonstrating understanding of version control & branching strategies.
• Automate everything by default.
• Write secure code by default.
• Write maintainable code and observe basic hygiene practices.
• Implement relevant project instrumentation.
• Follow the best practices of continuous BDD / TDD / Performance / Security / Smoke testing.
• Work effectively with product stakeholders to communicate and translate needs into product improvements.
• Lead group discussions on system design and understand domain well enough to work with Product Managers to drive value.
• Support production systems, resolve incidents and perform root cause analysis.
• Debug / find complex problems and support / maintain the software solution.
• Share knowledge with the wider engineering community, mentor and develop others around you.
• Produce proof of concepts to evaluate new tools.

Qualifications

• 5+ Years commercial experience as a Frontend Software Developer.
• Best‑practices regarding all aspects of web development including design, semantic HTML mark‑up, CSS, TypeScript, and related technologies.
• Exposure to a variety of JavaScript frameworks and libraries such as React, Redux, React‑Router and testing with React Testing Library, Jest, Cypress, Playwright, Jasmine, Enzyme, Mocha.
• Experience of creating high‑traffic applications, perhaps using Sails, Koa or similar.
• Awareness and practice of UI performance best practices.
• Understanding and exposure to integrating REST API endpoints.
• Strong experience and understanding of industry standard web accessibility, web design & usability; to support sites cross browser / platform / device.
• A desire to write readable, maintainable, modular and extendable code.
• Exposure to the DevOps model.
• Experience in Lean and Agile environments and understanding of principles behind methodologies such as BDD, ATDD and TDD.

Nice to have

• Bringing multiple viewport responsive and adaptive web designs to life.
• Modern JavaScript / TypeScript frameworks including Remix.
• Exposure to state machines and statecharts, Bonus points if this is with XState.
• Developing web applications within the constraints of “non‑standard” devices.

About us

Our vision at Tesco is to become every customer’s favourite way to shop, whether they are at home or out on the move. Our core purpose is ’Serving our customers, communities and planet a little better every day’. Serving means more than a transactional relationship with our customers. It means acting as a responsible and sustainable business for all stakeholders, for the communities we are part of and for the planet. Diversity, equity and inclusion (DE&I) at Tesco means that whoever you are and whatever your background, we always want you to feel represented and that you can be yourself at work. In short, we’re a place where Everyone’s Welcome. We’re proud to have been accredited Disability Confident Leader and we're committed to providing a fully inclusive and accessible recruitment process. We work in a more blended pattern – combining office and remote working. Our offices will continue to be where we connect, collaborate and innovate.