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Senior iOS Engineer
Senior iOS Engineer (Swift) – SumUp Pay
Location
London, United Kingdom
Team: Consumer
The Consumer team creates SumUp Pay, a regulated consumer banking app offering payments, card management, savings, and open banking, used daily by hundreds of thousands of customers. This high-impact squad—comprising engineers, product managers, and designers—works at breakneck pace on a product that deeply benefits users. We’re scaling our iOS engineering capabilities to match the appetite of our roadmap, and this role sits at the forefront of that growth.
As a Senior iOS Engineer, you’ll own pivotal parts of the customer journey from onboarding and KYC validation to savings features and in-app messaging—while shaping how we build, not just what.
What you’ll do
- Design, build, and ship key iOS features, including:
- KYC and card activation flows
- Savings functionality
- Open banking consent experiences
- Payment processing and customer-facing transactions
- Proactively ensure app stability, including:
- Performance monitoring
- Crash reporting
- Resolution of critical issues before they impact users
- Drive the evolution of iOS architecture, focusing on:
- Modularisation
- Dependency management
- Scalability as the app grows
- Partner with the CRM Manager to implement in-app messaging via Iterable, ensuring:
- Correct event instrumentation
- Accurate display logic for modals and banners
- Write clean, well-tested Swift code, contributing to:
- Peer code reviews
- CI/CD pipeline health
- Team-wide quality expectations
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You’ll thrive in this role if…
✔ Swift and iOS mastery: Proven track record shipping consumer-facing features in product-heavy environments. ✔ Backend collaboration: Experience with RESTful APIs, owning API contract design and implementation alongside backend engineers. ✔ Architectural foresight: Strong understanding of iOS design patterns, modular approaches, and best practices for maintainability. ✔ Fintech awareness: Comfort with regulated environments—balancing innovation with security, compliance, and data privacy requirements. ✔ User-led mindset: Product-oriented with the ability to anticipate usability challenges across the entire journey, not just technical feasibility.
Why join SumUp?
🌎 Global culture, local impact: Work in a vibrant team across diverse nationalities at our Covent Garden HQ, combining historic London charm with modern innovation (office-first).
🌈 Core values in action: Diversity, equity & inclusion are at the heart of our commitments—you’ll shape an environment where every voice is amplified.
🚀 Growth through ownership:
- Virtual Stock Options (VSOs) to invest in SumUp’s future
- Dedicated L&D budgets covering conferences and courses
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🏖 Wellness and flexibility:
- 28 days paid leave per year
- Private health (including dental & optical)
- Retirement benefits: 7% company match (you contribute 5%)
🌅 Flexibility & perks:
- Sabbatical off after three years
- Gogeta salary-sacrifice commuter benefits
- Referral bonuses to reward introducing talent
- Life insurance (2× salary coverage)
About SumUp
We’re on a mission to empower millions of small businesses worldwide with simple, affordable financial tools. Over 3.7m businesses in 37 markets rely on SumUp for payments, financing, and customer relationships.
Our 3,000+ diverse team members from 90+ nationalities collaborate globally—driven by our values of belonging, continuous learning, and courage in innovation. This is not just a job; it’s a commitment to amplifying small business success.
🎥 See SumUp in action: Explore our Global Employer Brand video library or follow our journey on LinkedIn, Instagram, or TikTok.
Your career isn’t business-as-usual—neither is ours. Apply to write the next chapter.*
(Note: Real criteria: You don’t need to tick 100%. Our focus is on your potential, passion for impact, and what you’re eager to grow.)
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