Requirements

Expected technologies

Kotlin

Java

Spring Boot

PostgreSQL

Kafka

Docker

Kubernetes

AWS

GitHub

Grafana

Honeycomb

Our requirements

• You have 5+ years of professional backend engineering experience
• You’re fluent in Java or Kotlin and have 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

Optional

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

Your responsibilities

• 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