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Senior iOS Developer - POS Lite

Berlin, Germany · Mobile

The Merchant Growth Tribe’s mission is to build an ecosystem of simple yet powerful products for our 1.5m+ merchants around the world which will help them grow their business. In addition to our core product, the Point-of-Sale (POS) application, the teams within the Tribe also provide merchants with invoicing and eCommerce solutions. Beyond this, we aim to expand SumUp’s ecosystem with additional products and services such as accounting, marketing, loyalty and business analytics, all available in one place. The products we develop strengthen SumUp’s value proposition and ability to serve small merchants around the world.

What you’ll do

  • Help evolve our mobile Point-of-Sale solution, an integral part of SumUp, used by hundreds of thousands of people.

  • Write high quality, testable code, used by millions of people daily.

  • Collaborate with other engineers, designers and product managers in your team and across other teams to develop simple and delightful solutions for our merchants.

  • Mentor other engineers in engineering principles, design and implementation.  

To accomplish this, you’ll use these tools

  • Swift

  • Xcode

  • GitHub

  • Jenkins

  • Jira

  • OpenAPI

  • Cocoapods

Your profile

  • You have 6+ years of experience in iOS development with solid expertise in Swift.

  • You have a basic understanding of Objective-C.

  • You have 3+ years of experience in API design and/or Domain Driven Design.

  • Bonus: You are familiar with developing and integrating libraries into apps.

  • You have good writing skills and you’re able to communicate your ideas and designs effectively. 

  • You know what to test, why to test it, and how to write flexible tests that won't break.

  • You care about user interaction, usability and of course, making the interface beautiful.

SumUp is the place for you if

  • You want to work in an exciting and complex domain, affecting the everyday life of millions of merchants.

  • You want to collaborate with other talented people in designing and implementing solutions that delight and empower our merchant to pursue their passion.

  • You want to be part of an international team, spanning 3 continents and 8 cities.

  • You want to have fun!


  • Budget for attending conferences and advancing your career. We encourage you to speak at conferences and give talk.

  • We have a close, welcoming and international community. We get together regularly for brunches, cocktail nights, football and office parties

  • Free German & Yoga classes

  • Running & Soccer teams + Urban Sports Club membership (subsidised)

  • Semi-annual off-sites, where the tech teams from Berlin, Sofia, and São Paulo gather together. In the past we've gone to Bulgaria and Greece and a castle in the German countryside

  • SumUp Corporate Pension Scheme

  • All the startup swag you expect: kicker table, unlimited drinks & fruits

 About SumUp

We believe in the everyday hero. Those who have the courage to follow their passion and who have the strength and determination to realise their dreams. Small business owners are at the heart of all we do, so we're creating powerful, easy-to-use financial solutions to help them run their businesses. With a founder’s mentality and a 'team-first’ attitude, our diverse teams across Europe, South America and the United States work together to ensure that small business owners can be successful doing what they love. 

SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of race, color, 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. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind.