Senior iOS Engineer
With SumUp Consumer, SumUp is building a rewarding banking experience that connects people to the small businesses they love while enabling free transactions for merchants. This is a high-impact, hands-on engineering role where you will own the development and quality of the SumUp Consumer iOS application, working directly on features consumers interact with daily. You will collaborate closely with Backend Engineers, Product Managers, Designers, and Android Engineers to deliver polished, reliable mobile experiences.
Responsibilities
- ▹Build and ship features across key consumer banking areas, including KYC flows, card management, savings, open banking consent, and payment experiences
- ▹Write clean, testable Swift code and participate actively in code reviews to uphold high engineering standards
- ▹Contribute to and evolve the iOS app architecture, including modularisation, dependency management, and scalability patterns
- ▹Own performance and reliability by monitoring crash rates and proactively driving app stability
- ▹Maintain a culture of quality by writing unit and UI tests and contributing to the health of CI/CD pipelines
- ▹Collaborate cross-functionally with Backend Engineers on API design, Product Managers on roadmap priorities, and Designers on user experiences
Requirements
- ▹Strong proficiency in Swift and deep knowledge of the iOS framework (Objective-C knowledge is a plus)
- ▹Solid understanding of RESTful API integration and experience working with backend engineers on API design
- ▹Experience with agile methodologies, CI/CD pipelines, and pair programming
- ▹Deep care for user interaction, usability, and interface quality
- ▹Ability to understand a large problem, design a solution, break it into deliverable chunks, and ship it independently
- ▹Passion for clean, maintainable, and testable code
- ▹Mature, business-minded approach balancing high-quality engineering with pragmatism in a fast-paced environment
- ▹Self-driven and proactive, comfortable owning a domain with limited direct oversight
Nice to have
- ▹Objective-C knowledge
- ▹Previous experience in payments, financial services, or fintech environments
Soft skills
What we offer
- ▹Virtual Stock Option programme, giving a stake in SumUp's future success
- ▹Dedicated annual L&D budget
- ▹Competitive health and life insurance, including optical and dental cover and Life Assurance (2x salary)
- ▹Corporate pension scheme and referral bonus
- ▹28 days of paid leave plus public holidays and special leave days
- ▹1-month paid sabbatical after 3 years of service (Break4me)
- ▹Global offsites and/or hackathons
About the company
SumUp is on a mission to empower small businesses across the globe with simple, affordable tools to start, run, and grow their businesses. Over 4 million businesses in 36 markets rely on SumUp, and its team numbers more than 3,000 people from over 90 nationalities.