Senior Android Engineer
As a Senior Android Engineer at SumUp, you will shape the company's specialized merchant-facing ecosystem, building and scaling high-impact solutions such as Kiosks, Kitchen Display Systems (KDS), Customer Facing Displays (CFD) and POS peripherals. The role bridges hardware and software to create seamless experiences for millions of merchants and their customers. This is an office-first position based in SumUp's central Covent Garden location in London, and it does not offer visa sponsorship.
Responsibilities
- ▹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 the transition toward Kotlin Multiplatform (KMP) to share business logic across the 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
- ▹Collaborate with cross-functional teams to deliver cohesive features for global enterprise partners
- ▹Lead code reviews, enforce architecture standards and mentor other engineers on reusable UI development
Requirements
- ▹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
- ▹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 speed
- ▹Excellent verbal and written English communication skills
- ▹Authorization to work in the UK (this position does not offer visa sponsorship)
Nice to have
- ▹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
Soft skills
What we offer
- ▹Virtual Stock Option programme (stake in SumUp's future success)
- ▹28 days of paid leave plus bank holidays and special leaves
- ▹Annual L&D budget for conferences and further education
- ▹Private health insurance, including optical and dental
- ▹Salary-sacrifice commuter benefits via Gogeta
- ▹Retirement scheme (SumUp matches 7% when you contribute 5%)
- ▹Life insurance from MetLife for 2x your salary
- ▹1-month sabbatical after 3 years of service (Break4me)
- ▹Referral bonus
About the company
SumUp believes in the everyday hero. Small business owners are at the heart of all it does, so the company creates tools that help them run their businesses. With a founder's mentality and a team-first attitude, its diverse teams across Europe, South America and the United States work together to ensure the small business owners they partner with can be successful. SumUp is an Equal Employment Opportunity employer.