Backend Engineer - Transfers

Backend Engineer - Transfers

Company: SumUp

Location: Vilnius, Lithuania

Employment: Full-time

At SumUp, the Global Bank tribe builds the core infrastructure and services that give merchants a digital business account, helping small businesses manage their banking needs easily and reliably.

The Transfers Gateway squad connects SumUp's internal systems to external financial networks across the EU and the UK. We build and run the services that move money through payment schemes every day. The team owns end-to-end scheme integrations and operates production services that process real money at scale. You'll help modernise existing systems while balancing reliability, correctness, and change, making architectural decisions that directly affect uptime and merchant experience across multiple markets.

Our tech stack includes Go, AWS, Kafka, PostgreSQL, and Kubernetes, supported by a strong observability toolchain with Prometheus, Grafana, and Honeycomb. We also actively use AI-assisted development tools such as Cursor, GitHub Copilot, and others.

SumUp's engineering culture is built around ownership. We follow a "build it, run it, improve it" model, with strong observability and a focus on learning. Engineers have clear scope and autonomy, with decisions documented, reviewed, and made collaboratively.

The Vilnius team is a core part of the Global Bank domain. We own production systems, shape technical direction, and work closely with colleagues across SumUp's global offices on critical merchant banking capabilities.

What You'll Do:

• Build and maintain production money movement backend services, contributing to their delivery, observability, and ongoing maintenance
• Own and deliver well-defined tasks and features, and contribute to larger projects within the team's domain
• Contribute to technical design and implementation, following established architectural patterns and best practices
• Improve service reliability and quality by writing tests, enhancing monitoring, and following established delivery pipelines
• Support the operation of the systems you work on by participating in on-call rotations, incident response, and learning from post-incident reviews
• Apply a backend and systems perspective during refinement, raising questions about risks, dependencies, and edge cases
• Collaborate closely with Product, QA, and other engineers to deliver end-to-end transfer and banking capabilities

You'll be great for this role if you

• Have experience building backend services in a modern environment and supporting them in production
• Can take a clearly defined problem and implement a solution independently, seeking guidance when needed
• Are comfortable working with cloud-based systems, containerized workloads, and automated delivery pipelines
• Have experience writing and maintaining automated tests and care about code quality
• Understand the fundamentals of system architecture, data modelling, and API design, and are eager to deepen this knowledge
• Are curious about how your work fits into the broader system and product experience
• Communicate clearly and collaborate effectively with engineers, product managers, and other stakeholders

Any of the following would be considered a plus

• Exposure to banking, payments, or financial systems, especially in regulated environments
• Experience supporting systems with production traffic, including participating in incident response
• Use of AI-assisted tools to improve development speed, learning, or code quality

Why you should join SumUp:

• Truly global team of 3200+ skilled professionals from 92+ countries, spread across 4 continents
• Commitment to Diversity and Inclusion
• Virtual Stock Option programme
• 25 days of paid leave, plus special holidays
• Health insurance through Gjensidige and life & accidental coverage from Ergo
• Gym membership allowance
• Career growth: yearly learning budget (EUR 2,000)
• Hack Days every second Friday, and global Hack Weeks
• Break4me: 1-month sabbatical after 3 years of service
• Referral Bonus

Compensation: Starting from 3,500 to 5,200 Euro Gross/month + 2000 EUR annual learning budget + Virtual Stock Options. Ranges may vary based on skills and experience.

About SumUp:

At SumUp, we're on a mission to empower small businesses around the world with simple, affordable tools to help them start, run, and grow. More than 4 million merchants across 37 markets trust us as their financial partner.