Senior iOS Engineer (KMP) - POS

SumUp; Paris (KY); On-site; USD 78,000 - 112,000; Full time

Benefits offered by this job

Stock options

L&D budget

Pension plan

Health insurance

Restaurant tickets

Transport allowance

Sabbatical after 3 years

Referral bonus

Job summary

SumUp seeks a Senior iOS Engineer to build hospitality workflows across iOS and Android, using SwiftUI and Kotlin Multiplatform. You’ll tackle multi-device synchronization and a large, established app within a small, fast-moving squad.

You’ll join SumUp’s Paris location, collaborating with Android engineers, participating in reviews and pair programming, and shaping architecture while delivering high-quality ordering features for hospitality merchants.

Qualifications

• 5+ years of production iOS experience in Swift.
• Large codebase experience with pragmatic improvements.
• Willingness to learn Kotlin and Kotlin Multiplatform (KMP).

Responsibilities

• Design and build new ordering experiences in SwiftUI for iOS; evolve table management and printer integrations.
• Contribute to shared Kotlin Multiplatform business logic and shape ordering-domain architecture.
• Improve reliability and usability of ordering features across devices (phones, tablets, POS).
• Collaborate with Android engineers to maintain cross-platform consistency.
• Participate in code reviews, pair programming and testing to maintain code quality.
• Refine upcoming work and contribute to product and architectural decisions.

Skills

Swift

SwiftUI

Kotlin

Cross-platform

Code quality

Communication

Tools

Kotlin Multiplatform

Job description

Team description

The Order Taking squad owns core ordering experiences within SumUp’s Point of Sale app, including the shopping bag, checkout, the catalog experience within ordering, open orders, table management and printer integrations. These capabilities help thousands of hospitality merchants manage orders reliably during daily service.

As a Senior iOS Engineer, you’ll build new hospitality workflows and evolve established ordering experiences across iOS and Android. You’ll work with SwiftUI on the platform-specific UI and contribute to shared Kotlin Multiplatform business logic. The role involves complex mobile engineering across multi-device synchronisation, shared order state and a large, established application.

You’ll join a small, experienced and fast-moving squad that works collaboratively through technical refinement, code reviews and pair programming. The team values engineers who communicate directly, challenge assumptions and proactively shape solutions rather than simply execute predefined tasks.

What you’ll do

• Design and build new ordering experiences in SwiftUI, while evolving established capabilities such as table management, kitchen workflows and printer integrations
• Contribute to shared Kotlin Multiplatform business logic and help shape the architecture of the ordering domain
• Improve the reliability and usability of ordering features used daily by hospitality merchants across phones, tablets and POS devices
• Collaborate closely with Android engineers and platform teams to maintain consistent cross-platform behaviour and reliable multi-device order synchronisation
• Take part in code reviews, pair programming and collaborative testing to maintain a high quality bar
• Help refine and scope upcoming work, bringing technical judgement to product and architectural trade-offs
• Contribute to Mobile Chapter and KMP platform initiatives across the wider POS tribe

You'll be great for this role if...

• 5+ years of experience building production iOS applications in Swift, with strong SwiftUI knowledge
• Experience working in a large, established codebase and making pragmatic improvements without requiring a full rewrite
• Openness to learning and contributing to Kotlin and Kotlin Multiplatform; previous hands-on KMP experience is welcome but not required
• Ability to work independently, challenge assumptions, propose solutions proactively and communicate clearly and directly
• Experience collaborating closely with Android engineers or other cross-platform partners to align product behaviour
• Sound technical judgement and the ability to balance product delivery, code quality and long-term maintainability

Why you should join SumUp

• Opportunity to work with a truly global, multicultural team from our Paris location. This involves an office-first setup
• 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 of €2000 for your individual development, which can be used to attend conferences and/or advance your career through further education
• Financial security: corporate pension contributions that support your long-term future
• Healthcare support: we cover 50% of the monthly cost of your health insurance for your Mutuelle and Prévoyance
• Extra allowances: we offer restaurant tickets (Swile) and cover transportation costs
• Break4me: 1-month sabbatical after 3 years of service
• Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team

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 simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 39 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 4,000 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 inclusivity and a 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. Discover more about our culture and opportunities on our careers website, and follow our journey on LinkedIn, Instagram, and TikTok.

Job Application Tip

We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.