Senior Android Developer, KMP - Point-of-Sale Tribe

SumUp; Köln; Vor Ort; EUR 50.000 - 90.000; Vollzeit

Zusammenfassung

An established industry player is seeking a Senior Android Developer to join their innovative team in Cologne. In this role, you will contribute to the evolution of their mobile applications using Kotlin Multiplatform, collaborating with cross-functional teams to deliver exceptional user experiences. You will have the opportunity to shape the product's architecture, mentor fellow engineers, and work on large-scale fintech solutions that empower small businesses globally. The company fosters a culture of learning and development, offering generous benefits and a collaborative environment that sparks creativity and teamwork.

Leistungen

Annual Learning & Development budget

Virtual stock ownership program

28 days’ paid leave

Global offsites and hackathons

Urban Sports Club subsidy

Kita placement assistance

Subsidized office lunches

Babbel language platform subscription

Qualifikationen

• 5+ years in mobile engineering with Android/Kotlin.
• Experience with Jetpack Compose and software design patterns.

Aufgaben

• Build new features for the item catalog within the SumUp SuperApp.
• Enhance and maintain our unified Android app across 60+ countries.

Kenntnisse

Android Development

Kotlin

Jetpack Compose

Software Design Patterns

Reactive Programming

Testing Best Practices

Clean Code

Jobbeschreibung

Cologne, Germany · Mobile

About the team

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 Cologne, where face-to-face interactions spark innovation and teamwork.

What you’ll do

1. Build new features for the item catalog within the SumUp SuperApp
2. Help improve the architecture of the application
3. Enhance and maintain our unified android app, distributed across 60+ countries, ensuring high-quality, scalable solutions
4. Shape the product’s evolution by identifying opportunities for improvement and contributing to daily decision-making
5. Write thorough documentation and implement robust testing for features before shipping
6. Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms
7. Coach and mentor other engineers

You’ll thrive in this role if:

1. You have 5+ years experience in mobile engineering with Android/Kotlin.
2. You have 2+ years of experience working with Jetpack Compose.
3. You have a solid understanding of software design patterns (e.g., MVVM, MVP) and expertise in building modular, scalable app architectures.
4. You have good knowledge of reactive programming (Flow, Coroutines and Concurrency).
5. You have a strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests.
6. You strive for clean code, and you are flexible to balance pragmatism and perfection.
7. You have a keen interest in multi-platform development using Kotlin Multiplatform.

Why you should join SumUp

1. The opportunity to work on large scale fintech products used by millions of small businesses around the world
2. A dedicated annual Learning & Development budget for attending conferences and/or advancing your career through further education
3. Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success
4. 28 days’ paid leave
5. You’ll attend global offsites and/or hackathons.
6. You'd enjoy other great benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidized office lunches and other location-tailored benefits, Babbel language platform subscription and more!

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.