SumUp enables businesses to get paid easily, process orders quickly, sell online instantly and manage their money more efficiently. We create the tools businesses need to make their business and their customer experience thrive!

As a member of the Global Bank tribe, you’ll play a key part in helping us build SumUp's own digital bank. You’ll be part of a global, autonomous, cross-functional team that takes an aspect of our product and perfect it from concept to execution. Becoming a part of the Global Bank Tribe means working alongside ~250 people with 32 nationalities across Cologne, Berlin, São Paulo, Santiago, Sofia and Vilnius who love to take ownership, work with purpose and help businesses thrive.

As a Senior Android Engineer, you'll be part of an experience team that is responsible for building reliable, secure and easy-to-use features inside our mobile app that’s exposed to millions of users across the globe. You’ll empower merchants with a smooth, effortless and engaging banking experience.

What you’ll do

• Build our banking mobile app to help provide banking operations for our merchants across Europe
• Work with large scale, highly available and resilient modern systems
• Participate in architectural discussions, propose solutions, and contribute to the technical roadmap of our Android application.
• You’ll work within cross-functional feature teams (squads) in the Banking Tribe, all dedicated to delivering a top-tier product.
• Dive into the code and create clean components in our codebase, develop and refine features and how we write tests and maintain peak performance.
• Work closely with designers and product owners to build features that are maintainable, usable and beautiful.
• Help us rethink problems we've solved before in a different way as needs evolve
• Develop a wealth of knowledge about our complex problem domain as well as its implications in the interface and the backend – and how to manage it in a clean way

You’ll be great for this role if

• You have hands-on experience building mobile applications using Kotlin, and solid understanding of Android app design principles, patterns, and best practices.
• Good knowledge of architectural design patterns such as MVVM and MVP, and proven experience ensuring modularized and scalable app architecture.
• You care about user interaction, usability, and of course, making the interface beautiful
• Ability to take ownership and drive the development of exciting and impactful new features and products. 
• A genuine passion for writing well-structured, readable, and maintainable code
• You know what to test, why to test it, and how to write flexible tests that won't break.
• An agile mindset and experience with Agile practices (Pairing, TDD).
• You thrive in a team where you can learn and try new tech, collaborate on technical challenges and grow as a team.
• You have solid written and spoken english language skills, as you will be working with an international team. 

The Tech We Work With

• Language: Kotlin, some legacy code is still maintained in Java
• UI: Jetpack compose - our development features are primarily using XML based designs and you are free to choose compose/xml
• Architectural Patterns: Clean architecture. Navigation controller and single activity arch. MVVM at presentation layer.
• Dependency Injection: Hilt
• Communication: Kotlin Flows and coroutines, Detekt and checkstyle for code quality check
• Backend Integration: Majority of our tribe integrations are gRPC. Our new features are done using REST - (Retrofit, Okhttp, moshi standard stack)
• Authentication: OAuth
• Firebase: For Analytics, remote config and crashlytics. Grafana for better observability and crash alert integration to slack 
• Testing: JUnit, Mockito and jacoco for reports. UI Testing: We have UI tests for critical flows but we go with pyramid structure where the unit tests are the base and UI tests are at the tip.
• VersionControl: Git and github 

Why you should join SumUp

• The opportunity to work on large scale fintech products used by millions of small businesses around the world
• Work on a high impact squad that is at the core of the Bank Tribe
• A dedicated annual Learning & Development budget for attending conferences and/or advancing your career through further education
• Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success
• A corporate pension scheme 
• 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
• You’ll attend global offsites and/or hackathons.
• Join a truly global SumUp team of 3200+ people from 80+ countries, spread across 4 continents

About SumUp

We believe in the everyday hero.

Small business owners are at the heart of all we do, so we create powerful, easy-to-use financial solutions to 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. 

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.