Senior Android Engineer in London

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.

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.