Senior Android Engineer - Retail; SS

hackajob is collaborating with Sainsbury's DTD to connect them with exceptional professionals for this role.

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 don t think we re exaggerating when we say we have one of the most exciting data sets in the country. The insights we gain help us build scalable, high-performance products using cutting-edge technology, products that give our customers an amazing shopping experience, including our award-winning Smart Shop  an inclusive, agile environment, you ll have the space to be curious, experiment, and solve complex real-world challenges.

Best of all, you ll see your work in the hands of millions of people across the UK.As a Senior Android Engineer, you ll play a key role in shaping the future of our mobile platforms. You ll lead the design and delivery of high-quality Android solutions, influence technical direction, mentor engineers, and help establish engineering best practices across teams.

Working closely with Product, Design, and Engineering partners, you ll drive innovation and ensure our Android experiences remain scalable, resilient, and customer-focused.

• Lead the design, development, and evolution of large-scale Android applications using modern Kotlin-based technologies
• Own complex technical deliveries, driving solutions from discovery and architecture through to implementation and production support
• Define and influence mobile architecture, engineering standards, and technical strategy across multiple products and teams
• Mentor and support engineers, fostering technical growth and a culture of continuous improvement
• Collaborate with Product Managers, Designers, Architects, and Engineers to translate business objectives into scalable technical solutions
• Drive engineering excellence through modern software practices, automation, code quality, testing, observability, and CI/CD
• Contribute to platform-level initiatives, shared libraries, and cross-platform capabilities, including Kotlin Multiplatform
• Identify and address technical debt, performance bottlenecks, scalability challenges, and security concerns
• Champion customer experience, accessibility, reliability, and maintainability in all engineering decisions
• Actively contribute to the wider engineering community through knowledge sharing, technical leadership, and innovation

• Extensive commercial experience developing complex Android applications using Kotlin, including advanced use of Coroutines, Flows, Retrofit, Hilt, Room, Coil, Navigation Components, and Jetpack libraries
• Experience contributing to or leading adoption of Kotlin Multiplatform (KMP) solutions across Android platforms
• Expert understanding of modern Android architecture patterns, including MVVM, Clean Architecture, modularisation, and scalable application design
• Proven track record of leading the end-to-end delivery of mobile products across the full software development lifecycle
• Strong experience designing technical solutions and influencing architectural decisions within large-scale engineering environments
• Deep understanding of software engineering fundamentals, including testing, security, performance optimisation, observability, and CI/CD
• Advanced experience with automated testing frameworks including JUnit, Mockito, Turbine, and UI testing approaches
• Experience mentoring engineers, providing technical leadership, and driving engineering best practices within teams
• Ability to influence technical roadmaps, balancing customer needs, business goals, and long-term platform sustainability
• Strong stakeholder management and communication skills, with the ability to explain complex technical…