Senior Android Engineer- Hardware

SumUp; Berlin; On-site; EUR 70,000 - 105,000; Full time

Benefits offered by this job

Berlin Office

Virtual Stock Options

€2,000 L&D budget per year

Employer pension with 20% match

28 days paid leave + holidays

Urban Sports Club subsidy

Kita placement assistance

Subsidised office lunches

Break4me sabbatical after 3 years

Referral bonus

Job summary

SumUp in Berlin is seeking an experienced Android engineer to build and maintain apps for card readers and the SuperApp, with emphasis on reliability and offline/online payment flows.

You will work with Java and Kotlin, apply clean architecture, write tests, and collaborate with stakeholders across the team to drive features and improve release processes.

Qualifications

• Several years of Android development experience with Java and Kotlin.
• Strong understanding of clean architecture and Android SDK maintenance.
• Experience writing unit/integration tests and refactoring legacy code.
• Familiar with CI/CD pipelines and improving build/release processes.
• Good communication skills and ability to work with stakeholders.

Responsibilities

• Build and maintain Android apps for card readers, SDKs, and the SuperApp.
• Work on Bluetooth LE, online/offline payment flows, and Tap to Pay.
• Refactor legacy code to improve reliability and performance.
• Contribute to testing practices to raise code quality.
• Collaborate with peers and stakeholders to shape technical solutions.

Skills

Android development (Java/Kotlin)

Clean architecture

Android SDK maintenance

Unit & integration testing

CI/CD pipelines (GitHub Actions)

Stakeholder communication

Tools

Android Studio

GitHub Actions

REST APIs

Job description

Team description

The Hardware tribe builds the technology that turns everyday devices into secure, reliable card readers, from Bluetooth-connected dongles to fully in-house Tap to Pay on Android. You'll join a team solving genuinely hard problems: keeping payments working across flaky Bluetooth connections, handling online and offline flows without losing a transaction. It's a chance to go deep on Android engineering in a space where reliability really matters, since every merchant depends on these readers to get paid.

What you'll do

• Build and maintain Android applications for card readers, SDKs, and the SuperApp, covering both new features and improvements to existing systems
• Work on Bluetooth Low Energy connections, online and offline payment flows, and Tap to Pay functionality
• Refactor and modernise legacy code to improve reliability, performance, and maintainability
• Contribute to testing practices, including unit and integration tests, to raise overall code quality
• Collaborate with peers and stakeholders across the team to manage priorities and shape solutions to technical challenges

You'll be great for this role if...

• Several years of professional Android development experience, with solid proficiency in both Java and Kotlin
• Strong knowledge of clean architecture principles and hands-on experience maintaining Android SDKs
• Experience of writing unit and integration tests, and comfort refactoring legacy code without breaking existing functionality
• Familiarity with CI/CD pipelines, such as GitHub Actions, and an interest in improving build and release processes
• Ability to adapt to ambiguity and shifting priorities, with strong communication skills for working independently with stakeholders

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
• 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
• A dedicated annual L&D budget of €2000 for your individual development, which can be used to attend conferences and/or advance your career through further education
• A corporate pension scheme where we match up to 20% of your contributions
• Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches
• 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

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 38 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. Discover more about our culture and opportunities on our careers website, and follow our journey on LinkedIn, Instagram, and TikTok.