At a Glance
- Tasks: Develop and enhance the SumUp Pay iOS app, delivering seamless banking experiences.
- Company: Join a global fintech leader empowering small businesses with innovative financial tools.
- Benefits: Enjoy competitive salary, health insurance, stock options, and generous time off.
- Other info: Be part of a diverse team that values inclusion and personal growth.
- Why this job: Make a real impact on millions of users while working with cutting-edge technology.
- Qualifications: Proficient in Swift, with experience in API integration and agile methodologies.
The predicted salary is between 60000 - 80000 € per year.
About the Role
At SumUp, we're on a mission to bring merchants and consumers closer together and help local communities thrive. With SumUp Pay, we're building a rewarding banking experience that connects people to the small businesses they love while enabling free transactions for our merchants. SumUp Pay 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 Pay 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 do
- Build and ship features across key consumer banking product 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 across the codebase.
- Contribute to and evolve the iOS app architecture, including modularisation, dependency management, and scalability patterns as the product grows.
- 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.
What makes you great for this position
- 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 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.
- Passion for clean, maintainable, and testable code and a genuine pride in your craft.
- Mature, business‑minded approach—balancing high‑quality engineering with pragmatism in a fast‑paced environment.
- Self‑driven and proactive nature, comfortable owning a domain with limited direct oversight.
- Previous experience in payments, financial services, or fintech environments is a strong plus.
Why you should join SumUp
- Opportunity to work with SumUppers globally on large‑scale fintech products used by millions of businesses worldwide.
- 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.
- Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp’s future success.
- A dedicated annual L&D budget for your individual development, which can be used to attend conferences and/or advancing your career through further education.
- Competitive Health & Life Insurance: Includes comprehensive cover (optical, dental) and Life Assurance (2 × your salary).
- Financial Future: A corporate pension scheme and a referral bonus for bringing in top talent.
- Generous time off: 28 days of paid leave plus public holidays and special leave days.
- Break4me: 1‑month paid sabbatical after 3 years of service.
- Culture of Connection: Attend global offsites and/or hackathons with your teammates.
About SumUp
Be empowered to do more that matters. 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 commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. 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. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify.
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. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.
Senior iOS Engineer in London employer: Atlas Metrics
At SumUp, we pride ourselves on being an exceptional employer, offering a vibrant work culture that champions diversity and inclusion while empowering our employees to thrive. With a strong commitment to personal and professional growth, we provide generous benefits including competitive health insurance, a dedicated learning budget, and a unique sabbatical programme, all within a collaborative environment that values innovation and teamwork. Join us in shaping the future of fintech and make a meaningful impact on small businesses worldwide.
StudySmarter Expert Advice🤫
We think this is how you could land Senior iOS Engineer in London
✨Tip Number 1
Network like a pro! Reach out to current or former SumUp employees on LinkedIn. A friendly chat can give you insider info and maybe even a referral, which can really boost your chances.
✨Tip Number 2
Show off your skills! If you’ve got a portfolio or GitHub with projects that highlight your iOS expertise, make sure to share it during interviews. It’s a great way to demonstrate your coding chops and passion for clean, maintainable code.
✨Tip Number 3
Prepare for those technical interviews! Brush up on Swift and iOS frameworks, and be ready to discuss your experience with RESTful APIs and agile methodologies. Practising common coding challenges can also help you feel more confident.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows you’re genuinely interested in joining the SumUp team!
We think you need these skills to ace Senior iOS Engineer in London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV reflects the skills and experiences that align with the Senior iOS Engineer role. Highlight your proficiency in Swift and any relevant projects you've worked on, especially in fintech or payments.
Craft a Compelling Cover Letter:Use your cover letter to tell us why you're passionate about building seamless payment experiences. Share specific examples of how you've contributed to similar projects and what excites you about working at SumUp.
Showcase Your Code Quality:If possible, include links to your GitHub or any other repositories where we can see your clean, testable code. This gives us a glimpse into your coding style and your commitment to high engineering standards.
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it shows you’re keen on joining our team!
How to prepare for a job interview at Atlas Metrics
✨Know Your Swift Inside Out
Make sure you brush up on your Swift skills before the interview. Be prepared to discuss your experience with clean, testable code and how you've implemented it in past projects. They’ll likely want to see your understanding of the iOS framework, so be ready to dive deep into specifics.
✨Understand the Product and Its Users
Familiarise yourself with SumUp Pay and its features. Think about how you can enhance user interaction and usability. Show that you care about creating seamless experiences for consumers, as this aligns with their mission to connect people with small businesses.
✨Collaborate Like a Pro
Since this role involves working closely with Backend Engineers, Product Managers, and Designers, be ready to discuss your collaborative experiences. Share examples of how you’ve successfully worked in cross-functional teams and contributed to API design or product roadmaps.
✨Show Your Problem-Solving Skills
Prepare to talk about how you approach large problems and break them down into manageable tasks. They’ll want to see your ability to own a domain and drive solutions independently, so have some examples ready that showcase your proactive nature and engineering mindset.
