Senior Backend Engineer Go - Payments Reporting at Sumup

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. About the team The Payments Reporting team sits at the heart of SumUp's financial infrastructure, building the systems that millions of merchants rely on every day to reconcile, report, and understand their money. We're in the middle of something genuinely exciting: building a reporting platform that serves both external integrators and internal teams at scale - delivering everything from file-based exports to real-time API reporting. This role exists because our ambitions have grown faster than our current team of three backend engineers can sustain alone, and we need someone who can take meaningful ownership of complex backend work, freeing the team to move faster on the architectural changes that matter most. What you'll do • Build and maintain backend reporting features across Payout Reports, Payment Reports, Fee Invoices, and Transaction Reports • Develop and own Reporting APIs (including Transaction History and Payout History) that serve both external integrators and internal clients • Contribute to the migration of core payments functionality away from legacy systems, modernising the infrastructure that underpins our reporting platform • Take ownership of the operational health of reporting services: monitoring, incident response, and performance optimisation • Participate actively in planning and refinement sessions, bringing technical assessments and effort estimations to the table • Support junior engineers through code reviews, pairing sessions, and knowledge sharing You'll be great for this role if you have: • Strong experience building scalable, production-grade backend systems in Golang, with a solid grasp of concurrency patterns, goroutines, and channels • Deep familiarity with software design principles - SOLID, common design patterns, and microservices architecture - and the experience to apply them pragmatically • Hands-on experience with PostgreSQL or similar SQL databases, including query optimisation and database modelling • Confidence working in Kubernetes environments, configuring and managing resources • Clear, confident communication in English - written and spoken - and a collaborative approach to engineering: giving and receiving feedback openly Why you should join SumUp • 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our modern Sofia office. This involves an office-first setup • 🌈 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 in our Virtual Stock Option programme: you will own a stake in SumUp's future success • 📚 A dedicated annual L&D budget of €2000 for your individual development, which you can be used to attend conferences and/or advance your career through further education • 🏖 Generous time off: 25 days of paid leave, plus one extra day per year of service (up to 35) • 🏥 Peace of mind: comprehensive health and life insurance - includes dental coverage • 💪 Stay active: on-site yoga and a co-sponsored Multisport card offering access to hundreds of sports facilities • 🍽 Meal support: benefit from a tax-free food voucher program (100 EUR per month) plus flexibility via our Re:Benefits platform (40 EUR) • 🚌 Easy commute: free shuttle buses connecting directly to Joliot-Curie metro station • 👶 Family-friendly: new baby bonus • 🌴 Break4me: 1-month sabbatical after 3 years of service • 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team About SumUp Be empowered to do more that matters. 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 37 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. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. 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. Discover more about our culture and opportunities on our careers website, and follow our journey on LinkedIn, Instagram, and TikTok. 👀 Get a feel for our Sofia of... 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.