Senior Backend Engineer - Identity Lifecycle

SumUp provides simple and affordable financial tools that help small businesses manage payments, finance, and customer relationships. More than 4 million businesses in 36 markets rely on SumUp as their financial partner.

• 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
• Drive reliability and resilience across critical services through better observability, failure handling, incident response, and long-term risk reduction
• Work primarily with Go while maintaining and progressively modernising existing Java services
• Evolve domain models and service boundaries while reducing legacy complexity, duplicated logic, and tightly coupled integrations with a pragmatic, incremental mindset
• Own work end-to-end, from technical design and implementation to rollout and production follow-up
• Work across team and domain boundaries, turning ambiguous product and regulatory requirements into clear, scalable technical solutions
• Review code and designs, mentor engineers, and help raise engineering standards across the mission

• Strong professional experience building and operating production backend systems with high business impact
• Experience with Go and Java, including maintaining and evolving existing 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 with Docker and Kubernetes
• Strong ownership mindset and ability to take complex problems from definition through production
• Experience improving the reliability of business-critical systems and turning recurring incidents into lasting engineering improvements
• Strong communication skills and a collaborative approach across Engineering, Product, Compliance, Risk, and Operations

Будет плюсом:

• experience in fintech, payments, KYC/KYB, identity verification, or regulatory systems; translating regulatory and compliance requirements into clear, scalable engineering solutions and bridging Compliance and Engineering

• Office-first setup from the Berlin office
• Annual L&D budget of €2,000 for conferences and further education
• Enrolment in the VSOP program, with a stake in SumUp’s future success
• Corporate pension scheme matching up to 20% of contributions
• 30-Day sabbatical after 3 years of employment
• Referral bonus
• Urban Sports Club subsidy, Kita placement assistance, relocation assistance, and subsidised office lunches