Senior iOS Engineer in Welwyn Garden City

We’re looking for a Senior iOS Engineer to help build and evolve Tesco’s Digital Design System (DDS) implementation for iOS. The DDS Engineering team maintains the shared user interface foundations behind Tesco's digital ecosystem, supporting experiences used by millions of customers and colleagues every day.
This is a senior platform engineering role focused on reusable UI foundations: component APIs, accessibility, quality, documentation, release discipline, and developer experience for teams across Tesco’s digital estate. Prior design system experience is valuable, but not required; we’re most interested in strong platform engineers who enjoy building shared foundations used by many teams. You’ll work closely with design, accessibility, product engineering, and DDS peers to keep Tesco experiences consistent, scalable, and easy to build.
You'll create reusable components, improve developer tooling and documentation, support consuming teams, and help shape modern design-to-development workflows; using Figma, MCP integrations, agentic cloud workflows and AI-assisted engineering tools. This is not an “AI for AI’s sake” role: the goal is practical engineering impact, better component reuse, fewer inconsistencies, stronger accessibility, faster onboarding, and safer migrations.

• Build, maintain, and evolve Tesco DDS platform components for iOS, with clear APIs, strong test coverage, accessibility support, and release discipline.
• Translate DDS design intent, tokens, component states, and interaction guidance into production‑ready iOS implementation.
• Improve developer experience for consuming teams through documentation, examples, onboarding, support, and migration tooling.
• Collaborate with design, accessibility, product engineering, and platform peers to keep DDS implementation aligned across iOS, Android, React Native, and Web.
• Use AI‑assisted engineering tools responsibly where they improve quality, speed, consistency, or developer self‑service.
• Help make DDS documentation and component metadata more useful to humans and AI agents through MCP‑ready context, examples, and clear constraints.
• Lead through senior engineering craft: architectural judgment, code review, mentoring, pragmatic delivery, technical clarity, and high‑quality communication.
• Relocation Help - professional service to secure relevant working permits and other necessary documents
• Learning opportunities - certified technical training and learning platforms like Udemy, Pluralsight, and O'Reilly
• Learning culture and excellent opportunities to develop your career within your chosen field or something altogether new
• Varied and exciting projects to play a part in - there is always something new and exciting in the pipeline

You might know us as a supermarket, technology company or even for our award-winning mobile network. Truth is, we’re all of those things, and much more. Our colleagues work with one goal in mind, helping to make every day a little better for our customers, colleagues and communities all over the world. No two customers are the same, neither are our colleagues. At Tesco, we champion a balance that lets you thrive both in and out of work. Spend 60% of your week collaborating with colleagues at our office locations or local sites and the rest remotely. Whether you're just kicking off your career, juggling passions, or navigating big life events, we're here to support you. We’re proud to be an accredited Disability Confident Leader, where everyone’s welcome. That’s why we commit to providing a fully inclusive and accessible recruitment process.