Android Engineer - Engagement Mission

About the team

The Super App & Web squad sits within the Engagement Mission under Sum Up's Run & Grow tribe, and we're responsible for one of the most strategically important surfaces in Sum Up's product ecosystem, the merchant app home screen.

Our mission is simple but ambitious: make every Sum Up merchant feel empowered, informed, and engaged every time they open the app.

We own the home screen, tools section, and profile & settings across i OS, Android, and Web, and we build with four core objectives in mind:

• Activate merchants so they start using Sum Up products as early as possible, through a first-class onboarding and first-time user experience
• Cross-sell & upsell Sum Up products to the right merchants at the right time, via smart promotional components
• Surface insights that help merchants manage and grow their businesses through home screen widgets
• Enable navigation to the most relevant screens of the app.

The squad is cross‑functional and collaborative, made up of i OS, Android, and full‑stack engineers, a senior backend engineer, a senior product manager, a senior designer, and an engineering manager.

You'll be paired with a senior Android engineer who will support your onboarding and growth, giving you the space to develop your skills while contributing meaningfully from day one.

• What you’ll do
• Build and maintain features of the Android Super App home screen, including the first‑time user experience, home screen widgets, quick actions, customization, tools section, profile & settings, and promotional channels, with guidance from your senior peers
• Contribute to the Personas initiative, helping build a tailored and customizable home screen experience that reduces friction and surfaces relevant data for each merchant
• Support codebase modularization and refactoring efforts, learning how to write scalable, maintainable code in a real‑world production environment
• Participate in the definition and refinement of team initiatives, asking good questions, sharing ideas, and growing your technical judgment over time
• Take part in code reviews as both a contributor and a reviewer, building good habits around clean code and engineering best practices
• Write clear technical documentation and gradually build confidence communicating with stakeholders across product, design, and engineering
• Embrace a culture of curiosity, ownership, and continuous learning, this is a place where growth is expected and supported
• You’ll be great for this role if you
• Are proficient in Kotlin and have hands‑on experience with Jetpack Compose for building Android UIs
• Have a working knowledge of MVVM, MVP, or similar architectural patterns and understand the value of clean, well‑structured code
• Experience working with large monorepos and building different flavors of Android apps
• Are comfortable working in evolving codebases and are eager to learn how to navigate complexity and contribute to refactoring efforts
• Have a genuine UI/UX sensibility, you care about building experiences that feel right, not just code that compiles
• Are a team player who has worked alongside engineers, product managers, and designers in a cross‑functional environment
• Bring curiosity, adaptability, and a growth mindset, you ask questions, take initiative, and aren't afraid to say "I don't know yet, but I'll find out"
• Can communicate your ideas clearly in writing and are willing to build your technical documentation skills over time
• Nice to have
• Experience with Firebase, Optimizely, or API design
• Experience with Design Systems, motion, or accessibility on Android
• Why you should join Sum Up
• Opportunity to work with Sum Uppers 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 Sum Up’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 Sum Up
• Referral Bonus: Earn additional rewards by referring talented individuals to join the Sum Up team
• Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches

Sum Up is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce.

Sum Up 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.

Sum Up also strives for a healthy and safe workplace and strictly prohibits harassment of any kind.

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