Senior Android Engineer - KMP

SumUp Inc.; Berlin; Vor Ort; EUR 90.000 - 120.000; Vollzeit

Benefits dieser Stelle

28 days paid leave + 1 for birthday

Sabbatical program for tenured SumUpp​

Health & wellness benefits

Enrollment into stock ownership plan

Zusammenfassung

SumUp Inc. is hiring a Senior Android Developer in Berlin to drive mobile engineering efforts across Android and Kotlin. You will contribute to a Kotlin Multiplatform strategy, mentor teammates, and shape the evolution of our SumUp SuperApp used by merchants in 60+ countries.

The role emphasizes user-centric design, precise collaboration in a cross-functional team, and delivering high-quality, scalable mobile solutions on-site in Berlin.

Qualifikationen

• 8+ years of experience in mobile engineering with Android and Kotlin.
• 2+ years of experience with Jetpack Compose.
• Strong understanding of software design patterns (MVVM, MVI) and modular architecture.
• Good knowledge of reactive programming (Flow, Coroutines).
• Strong testing practices and resilient tests.
• Commitment to clean code and balancing pragmatism with perfection.
• Interest in Kotlin Multiplatform for cross-platform development.

Aufgaben

• Build new features for the item catalog within the SumUp SuperApp.
• Help improve the architecture of the application and contribute to the Kotlin Multiplatform strategy.
• Enhance and maintain the unified Android app distributed across 60+ countries.
• Shape product evolution by identifying opportunities and participating in daily decisions.
• Write documentation and implement robust testing before shipping.
• Collaborate with Designers, Product Managers, and Android engineers to deliver a unified UX across platforms.
• Coach and mentor other engineers.

Kenntnisse

Android development

Kotlin

Jetpack Compose

MVVM / MVI patterns

Reactive programming

Testing best practices

Clean code

Kotlin Multiplatform

Jobbeschreibung

SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools.

Our POS solution integrates seamlessly into the SumUp SuperApp, which supports both our proprietary register hardware and mobile devices like tablets and phones.

As a Senior Android Developer, you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers.

About the role

We’re evolving toward a Kotlin Multiplatform (KMP) strategy, enabling shared development across Android and iOS. In this role, you’ll learn, refine, and help implement this technology, shaping the future of our mobile apps.

You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment.

This role is on-site in Berlin, where face-to-face interactions spark innovation and teamwork.

What you’ll do

Build new features for the item catalog within the SumUp SuperApp

Help improve the architecture of the application and contribute to our Kotlin Multiplatform strategy

Enhance and maintain our unified android app, distributed across 60+ countries, ensuring high-quality, scalable solutions

Shape the product’s evolution by identifying opportunities for improvement and contributing to daily decision-making

Write thorough documentation and implement robust testing for features before shipping

Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms

Coach and mentor other engineers

You’ll thrive in this role if:

You have8**+ years experience in mobile engineering with Android and Kotlin.**

You have 2+ years of experience working with Jetpack Compose.

You have a solid understanding of software design patterns (e.g., MVVM, MVI) and expertise in building modular, scalable app architectures.

You have a good knowledge of reactive programming (Flow, Coroutines and Concurrency).

You have a strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests.

You strive for clean code, and you are flexible to balance pragmatism and perfection.

You have a keen interest in multi-platform development using Kotlin Multiplatform.

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)

28 days paid leave + 1 for birthday

Sabbatical program for tenured SumUppers

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.