Senior Backend Engineer - Bookings

At SumUp, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance, and customer relationships. The role is within the Sell Online Tribe, a cross-functional team building tools to help merchants sell products and services online. The team focuses on the Online Store and Bookings products, enabling merchants to manage appointments, showcase offerings, and get paid from their phones.

• 5+ years of professional backend engineering experience
• Fluent in Kotlin (or Java) with deep experience in Spring Boot
• Experience with PostgreSQL, Kafka, Docker, Kubernetes, and AWS
• Understanding of RESTful APIs, distributed systems, and event-driven architectures (e.g. CQRS, Event Sourcing)
• Experience with CI/CD pipelines, GitHub Actions, and observability tools like Grafana or Honeycomb
• Ability to collaborate well in teams, mentor peers, and focus on delivering value to merchants

Nice to have:

• Familiarity with gRPC, Protobuf, or performance optimisation at the backend/database level

• 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 high reliability standards
• Actively contribute to shaping the technical roadmap for the Sell Online platform

The stated salary range represents expected compensation for candidates meeting core requirements; offers above may be considered in exceptional circumstances subject to internal review. Candidates do not need to meet 100% of criteria to apply; room for learning is accepted.