As a Senior iOS Engineer within the Design Systems team at Tesco Technology, you will play a critical role in shaping the foundations of our iOS experience at scale. This is a hands-on engineering role, focused on building scalable, reusable, and accessible iOS components and platform capabilities that power multiple customer-facing and colleague-facing applications—not a UI-only or documentation-focused position.
You will operate with a high degree of ownership, accountability, and technical judgment, working independently while collaborating closely with Product, Design, Android, and Backend partners. This role is ideal for an experienced engineer who is passionate about clean code, product craftsmanship, and continuous improvement, and who takes pride in raising the engineering bar for themselves and others.
Key Responsibilities
Design System & Platform Ownership
Be a key contributor to the iOS Design System, owning components and patterns from conception through adoption and long-term evolution.
Design and build scalable, reusable, and accessible UI components used across multiple applications serving millions of users.
Own and drive initiatives end-to-end, from problem definition through implementation, adoption, and ongoing improvement.
Technical Leadership & Architecture
Lead the design and implementation of robust iOS solutions with a strong focus on consistency, performance, maintainability, and developer experience.
Collaborate closely with Product, Design, Android, and Backend teams to deliver cohesive, cross-platform experiences.
Make well-reasoned architectural decisions, clearly communicate trade-offs, and demonstrate strong judgment while committing to shared team decisions.
Engineering Excellence
Write clean, readable, and testable code, holding yourself to a high quality bar and actively self-critiquing your work.
Apply modern iOS development practices across UI Kit and Swift UI, selecting the right approach for the problem at hand.
Continuously improve the codebase through refactoring, thoughtful API design, and clear documentation that enables other engineers to move faster with confidence.
Quality, Accessibility & Performance
Take full ownership of quality, including unit tests, UI tests, accessibility, and performance considerations by default.
Proactively identify and resolve performance issues, memory leaks, and usability gaps using appropriate iOS tooling.
Ensure all components align with Apple Human Interface Guidelines and Tesco’s accessibility and inclusion standards.
Culture, Collaboration & Values
Demonstrate “No one tries harder for customers" by building components that improve usability, consistency, and reliability at scale.
Live “We treat people how they want to be treated" by collaborating respectfully, being open to feedback, and supporting inclusive team dynamics.
Embrace “Every little help makes a big difference" by investing in developer experience, documentation, and incremental improvements that compound over time.
Mentor and support fellow engineers through code reviews, design discussions, and leading by example, without formal people-management responsibility.
Qualifications & Experience
Required
Bachelor’s or Master’s degree in Computer Science or a related discipline, or equivalent practical experience.
Significant hands-on experience building and maintaining production iOS applications at scale.
Deep expertise and strong understanding of the iOS platform, frameworks, and application lifecycle.
Excellent command of Swift, with a track record of writing idiomatic, maintainable, and well-structured code.
Hands-on experience using Swift UI to build and ship complex, real-world features or applications.
Strong understanding of object-oriented design, architectural patterns, and their impact on scalability and testability.
Proven ability to debug memory, performance, and concurrency issues using tools such as Xcode Debugger and Instruments.
Solid foundations in data structures, algorithms, and performance-aware system design.
Experience working in Agile environments and using tools such as Jira.
Nice to Have / Bonus
Links to published iOS applications on the App Store, particularly those leveraging Swift UI in meaningful ways.
Experience building or contributing to a shared design system or platform library.
Familiarity with CI/CD pipelines, release processes, or developer tooling for mobile teams.
What You’ll Gain
The opportunity to build iOS foundations used across multiple high-traffic applications.
Influence over platform direction and engineering standards without people-management overhead.
Exposure to real-world scale, complexity, and customer impact across millions of users.
A culture that values ownership, thoughtful engineering, respectful challenge, and continuous learning.