We believe in the everyday hero. Those who have the courage to follow their passion and who have the strength and determination to realise their dreams. Small business owners are at the heart of all we do, so we're creating powerful, easy-to-use financial solutions to help them run their businesses. With a founder’s mentality and a 'team-first’ attitude, our diverse teams across Europe, South America and the United States work together to ensure that small business owners can be successful doing what they love.

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

In the Transfers Gateway squad, you’ll work on the backbone that connects SumUp’s internal systems with external financial networks across Europe and the UK. The squad owns critical integrations with payment schemes and operates a large portfolio of production services that must be reliable, performant and secure.

As a Senior Backend Engineer, you’ll help modernize existing systems while balancing innovation with stability, collaborate with teams across regions, and build reliable services that manage diverse markets with different regulations. If you enjoy solving complex problems on high-load systems, are curious about banking, and are looking for a team that tackles challenges head-on, we’d love to hear from you. Join our Vilnius Team today (Vilnius office).

Our Tech Stack includes: Golang, Kotlin, Java, Elixir, AWS, Kafka, PostgreSQL, Docker, Kubernetes etc. 

What You’ll Do

• Own production backend services end‑to‑end, including delivery, observability, maintenance, and operational support.
• Lead small‑to‑mid sized initiatives and take responsibility for significant parts of larger team’s domain projects.
• Contribute to architectural and design decisions, including system design, data modelling, and API boundaries.
• Improve service reliability and quality through testing, monitoring, alerting, and continuous improvement of delivery pipelines.
• Operate the systems you build by participating in on‑call rotations, incident response, and post‑incident reviews.
• Apply a backend and systems perspective during refinement, identifying risks, dependencies, and technical trade‑offs early.
• Collaborate closely with Product, QA, and engineers across teams to deliver end‑to‑end transfer and banking capabilities.

You’ll be great for this role if you

• Have previously led the implementation of backend services in a modern environment and supported them in production.
• Have experience defining technical approaches for loosely defined problems and driving them to completion.
• Are comfortable working with cloud‑based systems, containerized workloads, and automated delivery pipelines.
• Have strong experience writing and maintaining automated tests and upholding high code quality standards.
• Understand system architecture, data modelling, and API design, and can apply these principles pragmatically.
• Think beyond individual components and understand how backend decisions impact the overall product and user experience.
• Communicate clearly and work effectively with engineers, product managers, and other stakeholders.

Any of the following would be considered a plus

• Experience working on banking, payments, or other regulated financial systems.
• Prior ownership of systems with high operational load, including incident handling and reliability improvements.
• Proven use of AI‑assisted or parallelised AI tooling to improve engineering productivity.

Why you should join SumUp

🌎 We’re a truly global team of 3200+ skilled professionals from 92+ countries, spread across 4 continents. Join the team from our Vilnius office.

🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced

🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp’s future success

🏖️ Time off: 25 days of paid leave, plus special holidays

🏥 Peace of mind: health insurance through Gjensidige and life & accidental coverage from Ergo

💪 Stay active: gym membership allowance to help you keep fit on your terms

📚Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University cohort and a yearly learning budget (2,000 EUR)

💡We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks.

🛍 Everyday savings: access discounts on hundreds of brands via our Corporate Benefits platform

🌴 Break4me: 1-month sabbatical after 3 years of service

🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team

Compensation: From senior level 4,167 - 7,500 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 36 markets trust us as their financial partner — and we’re just getting started.

We’re a global team of 3,000+ people from over 90 nationalities, united by curiosity, collaboration, and care. Our core values and culture shape everything we do, fostering inclusion, learning, and belonging.

SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive.

👉 Explore more about our culture on our careers site, or follow us on LinkedIn and Instagram.

Job Application Tip

We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.