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. 

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 5+ 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.

About the team:

As a Senior Android Engineer in the Mobile Platform Squad, you’ll be part of the backbone of Mobile Engineering at SumUp. Your team is responsible for creating and maintaining the development environment that enables Mobile Developers to ship high-quality products efficiently. You’ll also provide help and guidance to SumUppers interacting with our mobile apps.

Our engineering culture is autonomous and driven by collaboration and innovation. You’ll connect with mobile engineers across the organization as your initiatives are far-reaching. The squad focuses on:

• Maintaining CI/CD pipelines for mobile projects.
• Building tools and infrastructure to enhance the developer experience.
• Supporting and improving the codebase across SumUp's mobile apps.
• Driving long-term technical impact at scale across the company.

What you’ll do:

• Shape the core experience of merchants and developers interacting with SumUp’s Android ecosystem.
• Develop and maintain tools, frameworks, and infrastructure that enhance the consistency, scalability, and reliability of our mobile apps.
• Collaborate with cross-functional teams, including product, design, and backend, to deliver seamless experiences.
• Work on CI/CD systems, developer tooling, and performance optimizations to streamline mobile development processes.
• Mentor team members and provide technical guidance across projects.
• Maintain a high bar for engineering excellence and continually raise it by introducing new technologies and best practices.
• Own technical projects from idea to implementation, ensuring they align with business needs and technical standards.

You’ll be great for this position if you have:

• 5+ years of professional Android development experience, with expertise in Kotlin and modern Android frameworks.
• Experienced in CI/CD pipelines, with tools like Github Actions, Fastlane, or similar platforms.
• A deep understanding of testing methodologies and best practices, including writing unit and UI tests.
• Experienced with modern architecture and design patterns.
• You’re passionate about developer experience, creating tools, and improving workflows for engineers.
• Strong collaboration skills and enjoy mentoring and guiding other engineers.
• Experience with modularized codebases, building and maintaining internal tooling, or SDK development is a plus.

Nice to have: 

• Experience providing modules/SDKs to be used by other Mobile Engineers
• Experience with Fastlane and Ruby
• Experience Kotlin Multiplatform

Why you should join SumUp:

🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Cologne office. This involves an office-first setup

🧑‍🔬 We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks.

🌈 Commitment to Diversity and Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced

📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education

🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success

💶 A corporate pension scheme where we match up to 20% of your contributions

🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp

🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team

🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches

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, colour, 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.

About us:

Be empowered to do more that matters.

At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. 

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, 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. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website, and follow our journey on LinkedIn and Instagram.

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 will be a B2B based role in Warsaw.

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 (Warsaw) 🇵🇱

🌎 Opportunity to work , from our vibrant Warsaw office with inspiring art-filled lounges and a skyline terrace in the Mennica Legacy Tower. 

🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 

🚀 Enrolment onto our VSOP program: you will own a stake in SumUp’s future success 

🚴 Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw 

🩺 Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind 

💰 PPK (Employee Capital Plan): grow your savings with joint contributions from SumUp and the State. 

🏖️ Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days 🌴 Break4me: 1-month sabbatical after 3 years of service 

🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team

As a Senior Android Engineer, you will be at the forefront of shaping our specialized merchant-facing ecosystem. You’ll have the unique opportunity to build and scale high-impact solutions - including Kiosks, Kitchen Display Systems (KDS), Customer Facing Displays (CFD), and POS peripherals  - that power complex retail and restaurant environments worldwide. In this role, your work will directly bridge the gap between hardware and software, creating seamless, world-class experiences for millions of merchants and their customers.

What you'll do:

• Drive the development and scaling of Android-based merchant solutions, focusing on self-service Kiosks and specialized point-of-sale interfaces.
• Build and refine high-impact features that enhance the merchant and consumer experience across a diverse product suite.
• Support our transition toward Kotlin Multiplatform (KMP) to share business logic across the wider mobile ecosystem.
• Create maintainable, accessible, and performant user interfaces using Jetpack Compose.
• Strengthen product reliability by implementing robust testing suites and expanding automated QA coverage across our hardware-integrated software.
• Collaborate with cross-functional teams to deliver cohesive features that meet the needs of global enterprise partners.
• Lead code reviews, enforce architecture standards, and mentor other engineers on best practices for reusable UI development.

You’ll thrive in this role if

• 5+ years of professional Android development experience with deep expertise in Kotlin.
• 2+ years of hands-on experience building production applications with Jetpack Compose.
• Professional experience or a keen interest in Kotlin Multiplatform (KMP) development.
• Solid understanding of software design patterns (e.g., MVVM, MVI) and building modular, scalable app architectures.
• High proficiency in reactive programming, including Flow, Coroutines, and Concurrency.
• A strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests.
• A pragmatic approach to engineering, balancing high-quality code with the speed required for global product launches.
• Excellent verbal and written English communication skills for effective cross-team collaboration.

Bonus points:

• Experience with hardware-integrated Android applications or POS peripherals.
• Experience in QA automation and improving CI/CD pipelines for mobile.
• Experience navigating and refactoring complex, large-scale codebases.

Why you should join SumUp:

🌎 Opportunity to work with a truly global, multicultural team from our central Covent Garden location, wrapped in historic charm and modern flair. This involves an office-first setup 

🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 

🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp’s future success 

🏖️ Generous time off: enjoy 28 days of paid leave, plus bank holidays and special leaves 

📚 A dedicated annual L&D budget for attending conferences and/or advancing your career through further education 

🏥 Health matters: private health insurance, including optical and dental 

🚗 Life made easier: salary-sacrifice commuter benefits via Gogeta 

💼 Financial security: retirement scheme (SumUp matches 7% when you contribute 5%) 

🛡 Peace of mind: life insurance from MetLife for 2× your salary 

🌴 Break4me: 1-month sabbatical after 3 years of service 

🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team

About SumUp

We believe in the everyday hero.

Small business owners are at the heart of all we do, so we're creating tools that 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 the small business owners we partner with 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, colour, 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.

SumUp will not accept unsolicited resumes from any source other than directly from a candidate.

About the team:

As a Senior Android Engineer in the Mobile Platform Squad, you’ll be part of the backbone of Mobile Engineering at SumUp. Your team is responsible for creating and maintaining the development environment that enables Mobile Developers to ship high-quality products efficiently. You’ll also provide help and guidance to SumUppers interacting with our mobile apps.

Our engineering culture is autonomous and driven by collaboration and innovation. You’ll connect with mobile engineers across the organization as your initiatives are far-reaching. The squad focuses on:

• Maintaining CI/CD pipelines for mobile projects.
• Building tools and infrastructure to enhance the developer experience.
• Supporting and improving the codebase across SumUp's mobile apps.
• Driving long-term technical impact at scale across the company.

What you’ll do:

• Shape the core experience of merchants and developers interacting with SumUp’s Android ecosystem.
• Develop and maintain tools, frameworks, and infrastructure that enhance the consistency, scalability, and reliability of our mobile apps.
• Collaborate with cross-functional teams, including product, design, and backend, to deliver seamless experiences.
• Work on CI/CD systems, developer tooling, and performance optimizations to streamline mobile development processes.
• Mentor team members and provide technical guidance across projects.
• Maintain a high bar for engineering excellence and continually raise it by introducing new technologies and best practices.
• Own technical projects from idea to implementation, ensuring they align with business needs and technical standards.

You’ll be great for this position if you have:

• 5+ years of professional Android development experience, with expertise in Kotlin and modern Android frameworks.
• Experienced in CI/CD pipelines, with tools like Github Actions, Fastlane, or similar platforms.
• A deep understanding of testing methodologies and best practices, including writing unit and UI tests.
• Experienced with modern architecture and design patterns.
• You’re passionate about developer experience, creating tools, and improving workflows for engineers.
• Strong collaboration skills and enjoy mentoring and guiding other engineers.
• Experience with modularized codebases, building and maintaining internal tooling, or SDK development is a plus.

Nice to have: 

• Experience providing modules/SDKs to be used by other Mobile Engineers
• Experience with Fastlane and Ruby
• Experience Kotlin Multiplatform

Why you should join SumUp:

🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Cologne office. This involves an office-first setup

🧑‍🔬 We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks.

🌈 Commitment to Diversity and Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced

📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education

🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success

💶 A corporate pension scheme where we match up to 20% of your contributions

🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp

🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team

🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches

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, colour, 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.

About us:

Be empowered to do more that matters.

At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. 

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, 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. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website, and follow our journey on LinkedIn and Instagram.

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. 

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.

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 an 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 have 3+ 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

• 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

• 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.

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 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 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

• 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

• 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.

About the Team

Join SumUp's Mobile Platform Squad as a Senior Android Engineer and become a cornerstone of our rapidly expanding Android ecosystem. With significant investment in flagship products, we are empowering our feature teams to deliver world-class experiences. You will be instrumental in building the robust foundation that enables over 40 Android engineers to operate with maximum productivity and efficiency, directly shaping the future of mobile payments for millions of merchants.

Our engineering culture champions autonomy, collaboration, and innovation. Your initiatives will have far-reaching impact, connecting with mobile engineers across the organization. This role is critical to:

• Eliminating Bottlenecks: Strategically addressing and resolving critical bottlenecks in CI/CD pipelines and app infrastructure that could impede the delivery of new features and improvements.
• Elevating Developer Experience: Architecting and implementing cutting-edge tools and infrastructure that drastically enhance the developer experience, reduce build times, and streamline workflows for our large Android engineering team.
• Modernizing a Mature Codebase: Driving the evolution and improvement of our Android codebase, focusing on code simplicity, maintainability, and overall health across all SumUp Android products.
• Ensuring Product Stability & Scalability: Providing foundational support and guidance across our diverse Android product portfolio, ensuring consistency, reliability, and seamless operation for Register, Android Terminal, SumUp Go, and the Merchant app.

What you’ll do:

• Strategic Impact: Lead the charge in shaping the core experience for both merchants and our internal Android developers, directly contributing to SumUp's ambitious Android product roadmap.
• Technical Leadership: Architect, develop, and maintain critical tools, frameworks, and infrastructure that significantly enhance the consistency, scalability, and reliability of our mobile apps, ensuring no negative impact across our distinct Android products.
• Performance & Efficiency: Spearhead initiatives in CI/CD systems, advanced developer tooling, and performance optimizations to dramatically streamline mobile development processes and reduce build times for our growing team.
• Codebase Evolution: Proactively tackle technical debt, improve code health, and introduce best practices to a complex, mature codebase, ensuring its longevity and adaptability.
• Mentorship & Collaboration: Provide invaluable technical guidance and mentorship, fostering a culture of excellence and knowledge sharing across our Android engineering chapter, often navigating legacy components and unknown technologies.
• End-to-End Ownership: Own critical technical projects from ideation through to successful implementation and impact measurement, ensuring they align with strategic business needs and uphold the highest technical standards.

You’ll be great for this position if you have:

• Deep Android Expertise: 5+ years of professional Android development experience, with a proven track record in Kotlin and modern Android frameworks.
• CI/CD Mastery: Extensive experience with CI/CD pipelines (e.g., GitHub Actions, Fastlane) and a passion for solving build time challenges and improving deployment efficiency at scale.
• Architectural Acumen: A deep understanding of testing methodologies, modern architecture, and design patterns, coupled with a strategic mindset to balance immediate needs with long-term architectural vision.
• Developer-Centric Passion: A genuine passion for developer experience, with a history of creating impactful tools and improving workflows for large engineering teams.
• Complex Codebase Navigation: Proven ability to navigate, understand, and significantly improve complex, mature, and often unowned codebases, demonstrating adaptability and problem-solving skills.
• Exceptional Communication: Strong collaboration skills and a natural ability to mentor and guide other engineers, effectively communicating complex technical concepts across diverse teams and handling context switching with ease.
• Bonus Points: Experience with modularized codebases, building and maintaining internal tooling, or SDK development in a multi-product environment

Why you should join SumUp:

🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup

🧑‍🔬 We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks.

🌈 Commitment to Diversity and Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced

📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education

🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success

💶 A corporate pension scheme where we match up to 20% of your contributions

🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp

🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team

🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches

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, colour, 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.

About us:

Be empowered to do more that matters.

At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. 

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, 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. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website, and follow our journey on LinkedIn and Instagram.

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 an 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. 

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 have 3+ years of 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:

• 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 

• 🚀 Enrollment onto our VSOP program: you will own a stake in SumUp’s future success 

• 🚴 Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw 

• 🩺 Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind 

• 💰 PPK (Employee Capital Plan): grow your savings with joint contributions from SumUp and the State. 

• 🏖️ Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days

• 🌴 Break4me: 1-month sabbatical after 3 years of service 

• 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team

About the Team

Join SumUp's Mobile Platform Squad as a Senior Android Engineer and become a cornerstone of our rapidly expanding Android ecosystem. With significant investment in flagship products, we are empowering our feature teams to deliver world-class experiences. You will be instrumental in building the robust foundation that enables over 40 Android engineers to operate with maximum productivity and efficiency, directly shaping the future of mobile payments for millions of merchants.

Our engineering culture champions autonomy, collaboration, and innovation. Your initiatives will have far-reaching impact, connecting with mobile engineers across the organization. This role is critical to:

• Eliminating Bottlenecks: Strategically addressing and resolving critical bottlenecks in CI/CD pipelines and app infrastructure that could impede the delivery of new features and improvements.
• Elevating Developer Experience: Architecting and implementing cutting-edge tools and infrastructure that drastically enhance the developer experience, reduce build times, and streamline workflows for our large Android engineering team.
• Modernizing a Mature Codebase: Driving the evolution and improvement of our Android codebase, focusing on code simplicity, maintainability, and overall health across all SumUp Android products.
• Ensuring Product Stability & Scalability: Providing foundational support and guidance across our diverse Android product portfolio, ensuring consistency, reliability, and seamless operation for Register, Android Terminal, SumUp Go, and the Merchant app.

What you’ll do:

• Strategic Impact: Lead the charge in shaping the core experience for both merchants and our internal Android developers, directly contributing to SumUp's ambitious Android product roadmap.
• Technical Leadership: Architect, develop, and maintain critical tools, frameworks, and infrastructure that significantly enhance the consistency, scalability, and reliability of our mobile apps, ensuring no negative impact across our distinct Android products.
• Performance & Efficiency: Spearhead initiatives in CI/CD systems, advanced developer tooling, and performance optimizations to dramatically streamline mobile development processes and reduce build times for our growing team.
• Codebase Evolution: Proactively tackle technical debt, improve code health, and introduce best practices to a complex, mature codebase, ensuring its longevity and adaptability.
• Mentorship & Collaboration: Provide invaluable technical guidance and mentorship, fostering a culture of excellence and knowledge sharing across our Android engineering chapter, often navigating legacy components and unknown technologies.
• End-to-End Ownership: Own critical technical projects from ideation through to successful implementation and impact measurement, ensuring they align with strategic business needs and uphold the highest technical standards.

You’ll be great for this position if you have:

• Deep Android Expertise: 5+ years of professional Android development experience, with a proven track record in Kotlin and modern Android frameworks.
• CI/CD Mastery: Extensive experience with CI/CD pipelines (e.g., GitHub Actions, Fastlane) and a passion for solving build time challenges and improving deployment efficiency at scale.
• Architectural Acumen: A deep understanding of testing methodologies, modern architecture, and design patterns, coupled with a strategic mindset to balance immediate needs with long-term architectural vision.
• Developer-Centric Passion: A genuine passion for developer experience, with a history of creating impactful tools and improving workflows for large engineering teams.
• Complex Codebase Navigation: Proven ability to navigate, understand, and significantly improve complex, mature, and often unowned codebases, demonstrating adaptability and problem-solving skills.
• Exceptional Communication: Strong collaboration skills and a natural ability to mentor and guide other engineers, effectively communicating complex technical concepts across diverse teams and handling context switching with ease.
• Bonus Points: Experience with modularized codebases, building and maintaining internal tooling, or SDK development in a multi-product environment

Why you should join SumUp:

🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup

🧑‍🔬 We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks.

🌈 Commitment to Diversity and Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced

📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education

🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success

💶 A corporate pension scheme where we match up to 20% of your contributions

🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp

🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team

🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches

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, colour, 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.

About us:

Be empowered to do more that matters.

At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. 

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, 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. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website, and follow our journey on LinkedIn and Instagram.