SumUp is looking for a Senior iOS Engineer (Swift) to join the Consumer team building SumUp Pay, a regulated consumer banking app spanning payments, card management, savings, and open banking, used by hundreds of thousands of customers daily. The London-based, office-first role sits at the heart of growing the iOS function. With a lean iOS team and a growing product surface, you will own meaningful parts of the SumUp Pay experience end-to-end and have real scope to shape how the team builds.
Responsibilities
- ▹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, resolving issues before they reach customers.
- ▹Contribute to the evolution of the 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.
- ▹Write clean, testable Swift code and contribute to code reviews, CI/CD pipeline health, and a culture of quality.
Requirements
- ▹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 appreciation for security, compliance, and data privacy considerations.
- ▹A product-oriented mindset that considers the user journey, bringing both craft and pragmatism to technical decisions.
Soft skills
What we offer
- ▹Enrolment onto the Virtual Stock Option programme with a stake in SumUp's future success.
- ▹28 days of paid leave plus bank holidays and special leaves.
- ▹Dedicated annual L&D budget for conferences and further education.
- ▹Private health insurance, including optical and dental.
- ▹Salary-sacrifice commuter benefits via Gogeta.
- ▹Retirement scheme with SumUp matching 7% when you contribute 5%.
- ▹Life insurance from MetLife for 2x your salary.
- ▹Break4me: 1-month sabbatical after 3 years of service.
- ▹Referral bonus for referring talented individuals.
- ▹Work from a central Covent Garden location in London (office-first setup).
About the company
SumUp is on a mission to empower small businesses across the globe with simple and affordable tools. Over 4 million businesses in 37 markets rely on SumUp to manage payments, finance, and customer relationships. Its diverse team of over 3,000 people from more than 90 nationalities fosters inclusivity and a continuous learning culture. The Consumer team builds and maintains SumUp Pay, a regulated consumer banking app.