About the role

As an iOS Engineer on the Hardware team, you’ll build the experiences that connect our SuperApp to the physical devices that power everyday transactions. You'll work at the intersection of hardware, mobile, and real-time communication, ensuring our merchants enjoy a flawless payment experience, no matter the conditions.

This is a hands-on, high-impact engineering role where you’ll collaborate across disciplines — from embedded firmware to product design — to bring delightful, resilient, and intuitive device experiences to life. You should be a mobile engineer with a product mindset who can fully own the features you are working on and remain flexible with changing priorities.

The role is based on-site in our office in Berlin. We believe in the power of face-to-face conversations that happen organically when working next to one another.

About the team

You have probably used our card readers to buy a cappuccino or pay your hairdresser already. In Hardware, we are passionate about creating these beautifully designed card payment devices and accessories that enable our merchants to start, run, and grow their own businesses. In doing so, we deal with a diverse range of engineering topics - industrial and electronic design, embedded systems, all the way to mobile apps and backend services.

We believe in open communication and constant learning over strict rules. If you're looking for the chance to innovate and help millions of small independent merchants succeed - join us!

Curious to know how it feels working in the Hardware team? Check out this out!

What you’ll do

• Develop and maintain SDKs and features that connect our iOS app to Bluetooth-enabled payment devices.
• Ensure secure, reliable, and low-latency communication between hardware and mobile apps.
• Own critical flows like device pairing, firmware updates, and transaction handling.
• Collaborate with cross-functional teams (Product, Embedded, Backend, QA) to deliver smooth end-to-end payment experiences.
• Champion clean architecture, modular design, and robust testing strategies.

You'll be great for this position if,

• You have experience building and shipping complex iOS apps or SDKs in both Objective-C & Swift.
• You have good knowledge of architectural design patterns such as MVVM and MVC, and experience ensuring modularized and scalable app architecture
• You're comfortable with Bluetooth Low Energy (BLE) and debugging connectivity issues.
• You understand multithreading, asynchronous flows, and low-level APIs in iOS.
• You strive for clean code, but also know how to be pragmatic when needed
• Your precise communication skills are well suited to working in a distributed team

Why you should join SumUp

• Be part of a company that values diversity and celebrates unique perspectives.

• Work with a global team of skilled professionals in an environment that fosters collaboration, learning, and growth.

• Be part of a global tribe building a banking solution from the ground up and delivering impactful solutions to the real-life problems of millions of SumUp merchants all over the world

• Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University leadership cohort and a yearly learning budget (2,000 EUR)

• Sabbatical program for tenured SumUppers

• Join a global team where you belong: Check out our D&I Initiatives and Employee Resource Groups such as Pride Club, SumAfro, Neurodiversity, Grupos Mais, Women in Tech, and more

• Health & wellness benefits: in-house fitness classes, gym in the office, subsidized Urban Sports Club and available psychotherapy sessions

• A lot of other benefits such as Subsidized Public Transport Card, Kita placement assistance, Pension Scheme, Language Learning platform/courses etc.

• Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success.

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.