Senior iOS Engineer (Fully Remote) in London

About the RoleAt SumUp, we're on a mission to bring merchants and consumers closer together and help local communities thrive. With SumUp Consumer, we're building a rewarding banking experience that connects people to the small businesses they love while enabling free transactions for our merchants.SumUp Consumer helps consumers manage their money with ease and get more from everyday spending. It offers seamless payment experiences and financial tools designed for modern life—spanning banking, cards, savings, and open banking.This is a high-impact, hands-on engineering role where you'll own the development and quality of the SumUp Consumer iOS application. You'll work directly on the features that consumers interact with every day, collaborating closely with Backend Engineers, Product Managers, Designers, and Android Engineers to deliver polished, reliable, and impactful mobile experiences.What you’ll doBuild and ship features across key consumer banking product areas—including KYC flows, card management, savings, open banking consent, and payment experiences.Own performance and reliability by monitoring crash rates, proactively identifying issues, and driving app stability before they impact consumers.Maintain a culture of quality by writing unit and UI tests and contributing to the health of our CI/CD pipelines.Collaborate cross-functionally with Backend Engineers on API design, Product Managers on roadmap priorities, and Designers on seamless user experiences.Solid understanding of RESTful API integration and experience working with backend engineers on API design.Experience working with agile methodologies, CI/CD pipelines, and pair programming.Deep care for user interaction, usability, and interface quality—you build things that feel great to use.Ability to understand a large problem, design a solution, break it into deliverable chunks, and ship it independently.Mature, business-minded approach—balancing high-quality engineering with pragmatism in a fast-paced environment.Previous experience in payments, financial services, or fintech environments is a strong plus.Why you should join SumUpð Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide.ð Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced.ð Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp’s future success.ð¶ Competitive Health & Life Insurance: Includes comprehensive cover (optical, dental) and Life Assurance (2 x your salary).ð Financial Future: A corporate pension scheme and a referral bonus for bringing in top talent.ð️ Generous time off: 28 days of paid leave plus public holidays and special leave days.ð Break4me: 1-month paid sabbatical after 3 years of service.At SumUp, we're on a mission to empower small businesses across the globe by providing a vast set of simple and affordable business tools to help them start, run, and grow their businesses. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster an inclusivity and continuous learning culture, providing a safe space for personal and professional growth. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy.