Responsibilities
- Design, build, and operate scalable backend services, APIs, event-driven workflows, and system integrations.
- Build reusable capabilities for merchant onboarding, identity verification, and KYC/KYB regulatory data collection.
- Improve reliability and resilience through observability, failure handling, incident response, and long-term risk reduction.
- Develop primarily in Go while maintaining and modernizing Java services.
- Evolve domain models and service boundaries while reducing legacy complexity, duplicated logic, and tightly coupled integrations.
- Own work end-to-end from technical design and implementation through rollout and production follow-up.
- Translate ambiguous product and regulatory requirements into scalable technical solutions across team and domain boundaries.
- Review code and designs, mentor engineers, and raise engineering standards.
Requirements
- Strong professional experience building and operating production backend systems with high business impact.
- Professional experience with Go and Java, including maintaining and evolving Java services.
- Strong knowledge of API design, distributed systems, asynchronous processing, data modelling, testing, and system design.
- Experience with event streaming platforms such as Kafka and observability tools such as Grafana or Honeycomb.
- Experience deploying and operating services in cloud environments such as AWS, ideally using Docker and Kubernetes.
- Experience improving the reliability of business-critical systems and converting recurring incidents into lasting improvements.
- Ability to own complex problems from definition through production.
- Strong communication and collaboration skills across Engineering, Product, Compliance, Risk, and Operations.
- Experience in fintech, payments, KYC/KYB, identity verification, or regulatory systems is a plus.
- Experience translating regulatory and compliance requirements into scalable engineering solutions is a plus.
Benefits
- Office-first setup from SumUp’s Berlin office.
- Global collaboration on large-scale fintech products used by millions of businesses.
- Hack Days every second Friday and global Hack Weeks.
- Annual learning and development budget for conferences or further education.
- Enrollment in the VSOP program.
- Corporate pension scheme with employer contribution matching.
- 30-day sabbatical after three years of employment.
- Referral bonus, Urban Sports Club subsidy, Kita placement assistance, relocation assistance, and subsidized office lunches.
Tech Stack
Categories
About SumUp
SumUp is a leading global fintech company committed to levelling the playing field for small businesses. Founded in 2012, we’re the trusted partner of over 4 million merchants in 37 markets, providing simple and affordable tools that help them manage payments, finance, and customer relationships. Our vision is a world where everyone can build a thriving business. Guided by this, we champion small business ownership by creating accessible solutions that empower entrepreneurs to grow and succeed. Our diverse team of over 3,000 SumUppers — representing more than 90 nationalities across 20 offices worldwide — is at the heart of our success. Beyond business, we donate 1% of the net revenue generated by Solo devices to environmental causes and support educational and entrepreneurial initiatives around the world. Recognised as a Top Global Employer for inclusion by the Stonewall Workplace Equality Index in 2022 and 2023, and awarded Fintech Diversity Initiative of the Year at the Irish National Fintech Awards in 2025, SumUp continues to build an inclusive, supportive, and purpose-driven workplace where everyone belongs.