Backend engineer in fintech

About the Run & Grow: Run & Grow is where SumUp builds the platforms and capabilities that help merchants discover, join, use, and continue growing with our products. The tribe brings together engineering, product, design, and revenue operations teams around two connected goals: helping SumUp serve and retain merchants, and accelerating acquisition, activation, and engagement.

• Design, build, and operate production-grade backend services, APIs, and integrations, primarily using Go.
• Build event-driven workflows and distributed systems using technologies such as Kafka and asynchronous processing.
• Define clear service boundaries, data models, schemas, and API contracts that other teams can use confidently.
• Build capabilities supporting merchant acquisition, identity, marketing technology, operations, risk, and compliance.
• Own technical work end to end, from discovery and system design through implementation, testing, deployment, and production follow-up.
• Modernise existing services and improve reliability through observability, security, failure handling, and incident response.
• Collaborate with Product, Data, Operations, Compliance, Risk, Sales, Marketing, and other engineering teams to turn complex requirements into practical solutions.
• Review code and designs, make pragmatic technical trade-offs, share knowledge, and mentor engineers around you

• Bring a strong backend engineering background in Go, or are a typed-language generalist ready to ramp up quickly
• Have designed APIs and distributed systems with clear contracts, versioning, and integration patterns
• Are fluent in relational and analytical databases (PostgreSQL, Snowflake) and comfortable making the right choice for the right use case
• Have built Kafka-based, event-driven systems and understand event sourcing and CDC patterns
• Have experience in auditable, high-trust systems where every decision must be traceable fintech, payments, or similar domains
• Have experience with testing, observability, and incident response practices and treat them as first-class concerns, not afterthoughts
• Take ownership of ambiguous problems and turn them into clear, scalable, and maintainable solutions.
• Communicate clearly, collaborate effectively, and explain technical concepts and trade-offs to different audiences.
• Value pragmatic engineering, continuous improvement, mentoring, and reliable production operations.

• Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup
• We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks.
• 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
• A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education
• Enrolment onto our VSOP program: You will own a stake in SumUp’s future success
• A corporate pension scheme where we match up to 20% of your contributions
• 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp
• Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team
• Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches