(Senior) Backend Engineer

SumUp empowers businesses to get paid effortlessly, process orders fast, sell online in minutes, and manage their money with confidence. We build the tools that help businesses — and their customer experiences — thrive. As a key member of the Payments BR Tribe, you’ll help shape and deliver innovative products that make a real difference for our merchants in Brazil. You’ll join a global, autonomous, cross\-functional team committed to turning bold ideas into seamless, high\-impact solutions. Being part of the Payments team means working alongside driven, purpose\-led people who take ownership, embrace challenges, and are passionate about helping businesses succeed. As a Senior Backend Engineer within the tribe, you’ll support on the design and delivery of robust systems that ensure accuracy, transparency, and trust in our financial operations. **What You’ll Do** * Guide engineering decisions and mentor other developers. * Design, implement, and maintain highly available backend services that process and reconcile transaction data at scale. * Redesign and evolve architectural systems to support the transition toward a standalone reconciliation and reporting application for payment receivables. * Collaborate with multiple squads and stakeholders to address urgent requests while protecting the squad’s long\-term technical vision. * Optimize database performance, improve test coverage, and ensure observability, resilience, and reliability across systems. * Actively participate in architectural discussions within the Payments BR tribe. **You’ll be great for this role if you:** * Have strong software engineering expertise, including code design, quality attributes, automated testing, CI/CD, performance optimization, resilience patterns, and distributed systems. * Are experienced with functional backend programming languages (experience with Golang is a plus). * Have deep experience with relational databases (especially PostgreSQL) and are comfortable with schema modeling, query optimization, and database tuning. * Worked with messaging queues (SQS, RabbitMQ) and stream processing platforms (Kafka). * Are comfortable working with MongoDB and Redis. * Are capable of producing clear, structured technical documentation. * Thrive in ambiguous environments, are adaptable, and can balance long\-term technical improvements with short\-term high\-priority demands. * Have advanced English proficiency and can present and discuss technical topics effectively in public forums or cross\-team settings. **Why you should join SumUp** **🌍 Global Experience** : Collaborate with a diverse team of 3,000\+ people from over 90 countries, and join our global off\-sites and hackathons. 🤝 **Collaborative Culture:** Join a team that values diversity, innovation, and teamwork, where your ideas and contributions truly matter. **📈 Career Growth** : Be part of a global team working on large\-scale fintech products used by millions of businesses. **💙 Great Benefits** : Health plans, meal vouchers (VR), Zenklub, Wellhub, life insurance, childcare allowance, and more. **📚 Learning \& Development** : Access an annual budget of **R$ 10,000** for education, certifications, and conferences. **🌴 Time Off** : Enjoy **30 additional days off** through our **Break4Me** program after 3 years at SumUp. **💸 Grow with Us:** Participate in our virtual stock program and benefit from SumUp’s success with company shares. **Learn More About SumUp** **🇧🇷** **Office tour at São Paulo** **💡** **Ask me anything: Engineering at SumUp** **🚀** **SumUp’s Innovation Hackathon** **🤝** **Get to know our hiring process** **Ready to Join us?** Apply now and help us shape the future of financial solutions for small businesses **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.