Be empowered to do more that matters.
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.
About the TeamYou’ll join the Sell Online Tribe, the group shaping how merchants bring their businesses to life online. We design and build tools that help millions of entrepreneurs, from barbers to bakers, sell their products and services anywhere. Our focus is on Online Store and Bookings, two products at the heart of SumUp’s ecosystem. Together, they give merchants the power to manage appointments, showcase their offerings, and get paid—all from their phones.
We’re a cross-functional team of Product Managers, Designers, and Engineers who move fast, collaborate openly, and care deeply about crafting beautiful, performant mobile experiences. As part of this team, you’ll help us expand into new verticals, close the feature gap, enabling us to position our product as a complete and competitive solution for small merchants, and make digital selling effortless for small businesses everywhere.
What You’ll Do- 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
- 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
🌎 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
*Disclaimer
The stated salary range represents the expected compensation for candidates who meet the core requirements of this role. Offers above this range may be considered in exceptional circumstances, subject to internal review and approval, where a candidate's qualifications, skills, or experience significantly exceed the role's standard expectations.
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.
Skills Required
- 5+ years of professional backend engineering experience
- Fluency in Kotlin or Java
- Deep experience with Spring Boot
- Experience with PostgreSQL, Kafka, Docker, Kubernetes, and AWS
- Understanding of RESTful APIs, distributed systems, and event-driven architectures
- Experience with CI/CD pipelines and GitHub Actions
- Experience with observability tools like Grafana or Honeycomb
- Familiarity with gRPC or Protobuf (nice to have)
- Experience in performance optimisation at the backend/database level (nice to have)
SumUp Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about SumUp and has not been reviewed or approved by SumUp.
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Leave & Time Off Breadth — Paid time off is positioned as a standout, including 22 vacation days that increase with tenure, public holidays, a quarterly Wellness Day, special leave, and a fully paid one‑month sabbatical after three years. This combination makes time-off benefits feel notably robust in the overall rewards package.
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Healthcare Strength — Health coverage is described as comprehensive, with medical plan options (including carriers such as Cigna and Kaiser) plus dental and vision. Company-paid life insurance and disability coverage are also part of the protection package in the U.S. materials.
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Retirement Support — Retirement benefits include a published 401(k) match formula that provides an employer match up to a stated cap. The clarity of the match structure supports straightforward evaluation during offer comparisons.
SumUp Insights
What We Do
SumUp believes that every business should have access to affordable, easy-to-use financial solutions, no matter their size. That’s why more than 3 million businesses worldwide rely on SumUp to run their business. What started out as one card reader has now turned into a range of payment hardware, banking solutions, marketing, and loyalty tools, invoicing, and so much more. From sales and marketing to product and engineering, our cross-functional US team works together to ensure that small business owners can be successful doing what they love.
Why Work With Us
SumUp USA is part of the global SumUp organization that stretches across multiple continents from Berlin to Sao Paulo. Our teams are multicultural, have a collaborative mindset and bold goals. Join our mission if you want to become part of the success story and help empower over 3 million merchants using SumUp already!
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