Senior Frontend Engineer

Sainsbury's; Greater London; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A leading UK retailer is seeking a Senior Front-End Engineer to design and deliver high-quality web applications that enhance customer experiences. The ideal candidate will have expertise in React.js and TypeScript, with a passion for mentoring and best practices. The successful individual will join a flexible work environment that fosters innovation and teamwork, contributing to a transformative tech landscape for millions. Competitive benefits including a bonus scheme, pension plan, and discounts available.

Benefits

Colleague discount across multi-brands

Holiday allowance

Bonus scheme

Pension plan

Special offers on gym memberships

Qualifications

• Strong proficiency in React.js and TypeScript with a focus on performance best practices.
• Experience with state management libraries and modern frameworks.
• Knowledge of software design, security, cloud, and CI/CD.

Responsibilities

• Develop and maintain robust, responsive, and accessible front-end applications.
• Lead feature development from concept to delivery.
• Monitor and maintain the health of front-end services.

Skills

React.js

TypeScript

Redux

Next.js

Jest

Playwright

Cypress

Job description

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 a multi-channel, multi-brand business serving millions of customers a day, with the UK’s largest loyalty scheme and an ever-evolving set of digital platforms. All this equals over 1.2 billion transactions each year, presenting a volume, depth, and complexity of data that few can match. We don’t think we’re exaggerating when we say we have the most exciting data set in the country. From the insights gained, we build scalable, high-performance products using cutting-edge technology that give our customers an amazing shopping experience – like our award-winning Smartshop app. In an inclusive, agile environment, you’ll have the space to be curious, to experiment, and to solve real-world challenges. And you’ll get to see your creations in the hands of millions of people across the UK.

As a Senior Front-End Engineer, you’ll play a key role in designing and delivering high-quality, user-focused web applications that improve customer experiences, drive efficiency, and help reduce business costs. You’ll lead the development of front-end features, applying sound engineering principles and architectural thinking to ensure performance, security, and maintainability. Your expertise will support the team in managing risk and compliance, while your passion for quality will help shape a culture of excellence.

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 be a role model for best practices, championing a customer centric mindset and a passion for finding creative ways to solve problems, mentoring fellow engineers as a progressive member of the engineering community.

Work-life balance is important to us, so we offer our colleagues as much flexibility as possible in line with the needs of their role. We trust them to decide how, where and when they work, combining remote and collaborative working with a flexible approach to hours, giving them plenty of time and space for life outside of work whilst delivering against our business goals.

More about the role

• Develop and maintain robust, responsive, and accessible front-end applications.
• Lead feature development from concept to delivery, ensuring high standards of quality and usability.
• Champion modern front-end practices and tools, driving continuous improvement and innovation.
• Monitor and maintain the health of front-end services, ensuring reliability, performance, and security.
• Collaborate cross-functionally to align technical solutions with business goals.
• Mentor junior developers and contribute to a culture of learning and excellence.

Essential Criteria

• Strong proficiency in React.js, TypeScript with solid understanding of accessibility, responsive design, and performance best practices.
• Knowledge of state management libraries such as Redux
• Familiar with modern front-end frameworks such as Next.js
• Knowledge of testing frameworks Jest, Playwright or Cypress
• Proven experience of software design and implementation, security, cloud, infrastructure as code and CI/CD

More about you

• Great expertise in engineering practice, including deep knowledge of engineering and architectural principles
• Self-driven and constantly striving to improve your team, division and peers through coaching and mentoring
• Drive for advocacy of agile/lean delivery methodologies
• A passion for enhancing your knowledge and evidence curiosity in emerging tech
• Display empathy and understanding in supporting colleagues in the team to deliver

Benefits

• Colleague discount across our multi-brands – Sainsbury’s, Argos and Habitat
• Holiday allowance
• Bonus scheme
• Pension plan
• Special offers on gym memberships, restaurants, holidays, retail vouchers and more