Senior Software Engineer, Android - KMP

SumUp; Paris; Sur place; EUR 60 000 - 80 000; Plein temps

Résumé du poste

A leading financial technology company in Paris is seeking an experienced mobile developer. You will contribute to building and enhancing features for the SumUp SuperApp, focusing on Android and Kotlin development. The ideal candidate has over 8 years of mobile engineering experience with a strong grasp of software design patterns and testing best practices. This role offers competitive salary and benefits, along with opportunities for learning and development.

Prestations

Competitive salary package

Virtual stock option programme

Learning & development budget

Corporate pension scheme

25 days’ paid leave

Regular team events

1-month sabbatical after 3 years

Qualifications

• 8+ years experience in mobile engineering with Android and Kotlin.
• 2+ years of experience working with Jetpack Compose.
• Solid understanding of software design patterns.
• Good knowledge of reactive programming.
• Strong grasp of testing best practices.
• Flexible to balance pragmatism and perfection.
• Interest in multi-platform development using Kotlin Multiplatform.

Responsabilités

• Build new features for the item catalog within the SumUp SuperApp.
• Help improve the architecture of the application.
• Enhance and maintain the unified android app.
• Identify opportunities for improvement.
• Write thorough documentation and implement testing.
• Collaborate with Designer, Product Manager, and engineers.

Connaissances

Mobile engineering

Android development

Kotlin

Jetpack Compose

Software design patterns

Modular architecture

Reactive programming

Testing best practices

Description du poste

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.

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.

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

You’ll thrive in this role if :

• You have 8 + 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 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

🌐 Opportunity to work with a truly global, multicultural team (3,000+ people from 93 countries across 4 continents).

💰 Competitive salary package & virtual stock option programme.

🎓 Learning & development budget for conferences and external training.

🏦 Corporate pension scheme, 25 days’ paid leave, and other great benefits.

🙌 A passionate, purpose-driven team that achieves incredible results together.

🎉 Regular breakfasts, team events, office parties & sports activities.

🌴 Break4me – 1-month sabbatical after 3 years of service.

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.