Senior Backend Engineer - Golang

You'll join SumUp's Merchant Intelligence squad within the Engagement Mission — a newly formed team building foundational backend services that create a shared source of truth for product and merchant data across the business. As a Senior Backend Engineer, you'll help design and build these services from the ground up, working closely with product, data, and engineering teams across SumUp to create scalable systems that are reliable, easy to integrate with, and valuable to a broad range of internal users.

What you'll do

• Design, build, and evolve foundational backend services that create a shared source of truth for product and merchant data across SumUp, with a strong focus on scalability, reliability, and ease of adoption by internal teams
• Develop and maintain robust APIs, data models, and integration patterns that enable teams across the business to access consistent and trustworthy product and merchant information
• Build and improve data ingestion, aggregation, and event-processing pipelines that bring together signals from across the SumUp ecosystem into actionable merchant intelligence
• Contribute to shaping the long-term architecture and strategy for the Product Catalogue and Merchant Intelligence services, helping establish platform capabilities that can be used across multiple systems and teams
• Write high-quality, maintainable backend code following engineering best practices for testing, observability, and production readiness
• Collaborate closely with product managers, data teams, and engineers across SumUp to identify needs, solve complex data challenges, and turn them into effective technical solutions
• Help define engineering standards, technical direction, and ways of working in a newly established squad operating in a complex and evolving domain

What you'll need

• Strong professional experience in backend engineering, building and operating reliable production systems
• Solid experience with Golang and designing scalable backend services
• Strong knowledge of API design, system design, and data modeling
• Hands-on experience with Postgres or similar relational databases
• Experience with AWS, Docker, Kubernetes, and infrastructure-as-code tools such as Terraform
• Familiarity with event-driven architectures and message brokers such as RabbitMQ or Kafka
• A strong ownership mindset, with the ability to work independently and navigate ambiguity
• Clear communication skills and a collaborative approach to working across product, data, and engineering teams

What they offer

• Office-first setup based in Berlin with opportunity to work with SumUppers globally
• Hack Days every second Friday and global Hack Weeks
• Annual L&D budget of €2,000 for conferences and further education
• VSOP program providing equity stake in SumUp's future success
• Corporate pension scheme with up to 20% matching of contributions
• 30 Days Sabbatical after 3 years of employment