Senior Backend Engineer - Accounts

About the role

As a Senior Backend Engineer on the Global Accounts team, you'll own critical pieces of our bank account platform. You'll help design and build a fully distributed, event-driven system designed to scale across regions with resilience and compliance built in. You'll work primarily in Kotlin, with opportunities in Elixir and Golang, practicing Extreme Programming: small iterations, daily deliveries, and a focus on technical design quality.

What you'll do

• Contribute to the design and implementation of a newly architected global accounts platform, migrating existing systems to a modern, event-driven, decoupled architecture that enables scalability and resilience across regions.
• Work extensively with Kafka to build a truly decoupled, resilient system where failures in one part don't bring down banking operations globally.
• Design flexible systems that handle varying regulatory and verification requirements across different regions and use cases.
• Build a self-service platform that empowers internal teams across the organization to contribute to and build on top of.
• Directly impact EU and LATAM markets, with potential US expansion on the horizon.

What you'll need

• Solid backend development experience in Kotlin, with interest in working across multiple languages (Golang, Elixir); understanding of system architecture, OO and functional design principles, data modeling, and API design (RESTful and event-driven).
• Proven experience with Kafka and event-driven systems and how they enable true decoupling and resilience in distributed systems.
• Hands-on experience building tested, observable, scalable, robust, and fault-tolerant distributed systems using AWS, Docker, Kubernetes, and relational databases.
• Full ownership of software from design to production readiness; you value clean, maintainable code and continuously refactor to keep designs simple and scalable.
• Curiosity and energy for complex problem-solving; you thrive with fast iterations and careful design where understanding the problem deeply is valued.
• Collaborative mindset: you communicate respectfully, share knowledge openly, and actively support teammates' growth.

What they offer

• Yearly learning budget (2,000 EUR), mentorship programs, and SumUp University leadership cohort
• Sabbatical program for tenured SumUppers
• Health and wellness benefits: in-house fitness classes, gym, subsidized Urban Sports Club, and psychotherapy sessions
• Subsidized public transport card, Kita placement assistance, pension scheme, language learning platform
• Virtual stock ownership program