> Markdown version of [/jobs/ext/1625410-senior-ios-engineer](https://www.wearedevelopers.com/jobs/ext/1625410-senior-ios-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior iOS Engineer - **Company:** Sumup Inc. - **Location:** London, UK - **Experience:** Expert - **Contract:** Temporary contract - **Skills:** Code Review, Continuous Integration, Backend, Modularization, Code Testing, Banner Advertisement, Performance Monitor, Api Design, Restful APIs - **Published:** July 3, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=ee2e33644a0208bd ## About the Role Strong proficiency in Swift and the iOS framework, with a track record of shipping consumer-facing features in a product environment. Experience integrating RESTful APIs and collaborating closely with backend engineers on API design and contracts. Solid understanding of iOS architecture patterns, modularisation, and writing maintainable, well-tested code. Comfort working in a regulated or fintech environment, with an appreciation for the security, compliance, and data privacy considerations that come with it. A product-oriented mindset - someone who thinks about the user journey, not just the implementation, and brings both craft and pragmatism to technical decisions. ## Description The Consumer team builds and maintains SumUp Pay - a regulated consumer banking app spanning payments, card management, savings, and open banking, used by hundreds of thousands of customers every day. We're a cross-functional squad of engineers, product managers, and designers working at pace on a product that genuinely matters to the people who rely on it. Right now, we're growing our iOS function to match the ambition of our product roadmap - and this role sits at the heart of that. As an iOS Engineer, you'll own meaningful parts of the SumUp Pay experience end-to-end, from onboarding and KYC flows through to savings features and in-app messaging. With a lean iOS team and a growing product surface, there's real scope to shape how we build - not just what we build. What you'll do .css-6fljt4{margin-bottom: var(-cui-spacings-mega);}.css-6fljt4 li: last-child,.css-6fljt4 ul: last-child,.css-6fljt4 ol: last-child{margin-bottom: var(-cui-spacings-byte);} Design, build, and ship iOS features across SumUp Pay - including KYC and card activation flows, savings, open banking consent, and payment experiences Take ownership of performance monitoring, crash reporting, and app stability, proactively resolving issues before they reach customers Contribute to the evolution of our iOS architecture - including modularisation, dependency management, and scalability as the product grows Partner with the CRM Manager to implement in-app messaging (modals and banners) via Iterable, ensuring correct event instrumentation and display logic on iOS Write clean, testable Swift code and contribute actively to code reviews, CI/CD pipeline health, and a culture of quality across the team ## Related Videos - [API Design - Getting Started](https://www.wearedevelopers.com/videos/33-api-design-getting-started) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Are Code Reviews Worth It? Insights from 16 Years of Review Data](https://www.wearedevelopers.com/videos/1135-are-code-reviews-worth-it-insights-from-16-years-of-review-data) - [SwiftUI In Production](https://www.wearedevelopers.com/videos/134-swiftui-in-production) - [Rest API Antipatterns](https://www.wearedevelopers.com/videos/100208-rest-api-antipatterns) - [Insights from building the Canva Developers Platform to empower 185 million designers](https://www.wearedevelopers.com/videos/942-insights-from-building-the-canva-developers-platform-to-empower-185-million-designers) ## Related Articles - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Basic And Advanced Networking in Dart and Flutter](https://www.wearedevelopers.com/magazine/112-basic-and-advanced-networking-in-dart-and-flutter) - [A Guide to Choosing the Right Tools for App Developers](https://www.wearedevelopers.com/magazine/391-a-guide-to-choosing-the-right-tools-for-app-developers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025) - [Cross Platform Mobile Development Frameworks to Use in 2025](https://www.wearedevelopers.com/magazine/404-cross-platform-mobile-development-frameworks-to-use-in-2025)