About SumUp
At SumUp, we're on a mission to empower small businesses across the globe by providing a vast set of simple and affordable business tools to help them start, run, and grow their businesses. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.
Responsibilities
•Design, build, and maintain scalable backend systems supporting SumUp's Bookings product
•Collaborate with frontend and mobile engineers to deliver new features and improve APIs across web, iOS, and Android
•Participate in technical planning, code reviews, and design discussions to ensure clean, testable, and maintainable code
•Continuously optimise performance, ensure observability, and uphold our high reliability standards
•Actively contribute to shaping the technical roadmap for the Sell Online platform
Requirements
•You have 5+ years of professional backend engineering experience
•You're fluent in Kotlin (or Java) and have deep experience with Spring Boot
•You've worked with PostgreSQL, Kafka, Docker, Kubernetes, and AWS
•You understand RESTful APIs, distributed systems, and event-driven architectures (e.g. CQRS, Event Sourcing)
•You bring experience with CI/CD pipelines, GitHub Actions, and observability tools like Grafana or Honeycomb
•You thrive in collaborative teams, enjoy mentoring peers, and care about delivering real value to merchants
Nice to have
•Familiarity with gRPC, Protobuf, or performance optimisation at the backend/database level
Conditions
•Opportunity to work from our vibrant Warsaw office in the Hala Koszyki. This involves a hybrid 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
•Fitness support: work out on-site at our gym or explore the city using the Multisport Card, subsidised by SumUp for access to sports facilities across Warsaw
•Commitment to well-being: access health insurance coverage for you and your family, plus life insurance to further protect your peace of mind
•Generous time off: enjoy 26 days of paid leave plus public holidays and special leave days
•Break4me: 1-month sabbatical after 3 years of service
•Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team
