Backend Engineer - Merchant Risk Intelligence

About the Position

Backend Engineer - Merchant Risk Intelligence

We are looking for a Backend Engineer to join our Merchant Risk Intelligence team in Vilnius, Lithuania. Our team is part of SumUp’s Risk & Compliance tribe, dedicated to building systems that protect SumUp and its merchants from fraud while supporting reliable, compliant business growth.

About the Team

Our team combines software engineering, machine learning, data science, product management, and risk expertise. You will join a multidisciplinary group working across backend services, data products, and AI-powered solutions. We value pragmatic engineering, thoughtful collaboration, and the ability to balance delivery speed with security, reliability, and long-term maintainability.

Responsibilities

• Develop new functionality and support existing services using Go.
• Contribute to the development of our in-house merchant risk decision framework.
• Design, build, and maintain reliable distributed systems and backend services.
• Collaborate with product managers, data scientists, machine learning engineers, fraud strategy teams, and operational stakeholders.
• Contribute to Python projects and AI-agent initiatives.
• Participate in code reviews, testing, monitoring, and continuous improvement of production services.
• Use AI-assisted development tools thoughtfully to deliver meaningful features faster.
• Be open to participating in an on-call rotation.

Requirements

• Professional experience developing backend software in Go or another language such as Java, C, or C++.
• Experience building and operating distributed systems and backend services.
• Strong system design skills and an understanding of reliable, maintainable software architecture.
• Experience working with Kubernetes and Kafka.
• Working knowledge of Python and/or interest in contributing to Python-based products or AI/agentic development.
• Experience using AI-assisted tools as part of your software development workflow.
• Experience working in agile, cross-functional teams and collaborating with stakeholders beyond engineering.
• A pragmatic, outcome-focused approach.
• A collaborative mindset and the confidence to challenge ideas constructively while remaining open to feedback.
• Motivation to learn about fintech, fraud prevention, risk, and compliance domains.

We Offer

• Opportunity to work with SumUppers globally on large-scale fintech products.
• Commitment to learning and experimentation with Hack Days and global Hack Weeks.
• Commitment to Diversity and Inclusion.
• A dedicated annual L&D budget of €2,000 for attending conferences and/or further education.
• Enrollment onto our VSOP program.
• Generous time off: 25 days of paid leave.
• 30 Days Sabbatical after completing 3 years of employment.
• Additional health insurance and life insurance.
• Gym allowance.
• Referral Bonus.

About the Company

At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance, and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth.

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age, or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

Job Application Tip

We recognize 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.