Senior Fullstack Engineer - Operations Platform at Sumup

About the team: As part of the Operations Platform Team within the Platform Tribe, you will contribute to building and evolving SumUp’s internal unified platform for standardized tools and backoffices that support global Operations. The team focuses on developing foundational systems and internal developer platforms that enhance operational efficiency, streamline workflows, and provide robust, flexible interfaces for product teams. As a Senior Fullstack Engineer, you will play a key role in developing scalable software systems that improve the developer experience when integrating domain-specific backoffices, while also enabling Customer Support teams to effectively assist our customers. You will work on key initiatives such as enhancing backoffice APIs, improving access management and auditing, and optimizing operational workflows. Overall, you will help design and build high-performance systems and a unified API ecosystem that enables multiple teams to independently configure and launch new operational use cases with flexible business logic—ultimately driving efficiency and delivering high-quality support to our customers. What you’ll do: • Design, build, and maintain fullstack applications, with a strong focus on backend services, ensuring dependable and highly available production systems aligned with SumUp’s microservices architecture • Develop and maintain scalable backend services and APIs, while also contributing to intuitive and efficient frontend interfaces • Contribute to shaping a long-term strategy that enables shared business processes to be used across multiple systems, triggered by automations, events, and user interactions • Write high-quality, scalable code across the stack, following Platform standards and best practices • Collaborate with stakeholders to identify pain points, gather requirements, and translate them into effective fullstack solutions • Work closely with Identity, Verification, Data, and Engineers across Platform and Operations teams to deliver end-to-end features and improve overall user experience You’ll be a great fit if you have: • 5+ years of professional experience, with strong proficiency in TypeScript • Solid experience building fullstack applications, with a backend-focused mindset Hands-on experience with modern fullstack frameworks such as Next.js, Remix, Nuxt, or Meteor, and strong proficiency in React • Strong experience designing and building scalable backend services and RESTful APIs within a microservices architecture • Experience working with SQL and event-driven architectures, particularly with Postgres and Kafka • Good understanding of system architecture, software design principles, data modeling, and API design • A collaborative mindset, with the ability to work closely with cross-functional teams and openness to feedback • Experience mentoring or supporting other engineers in their growth It would be a great addition if you have: • Experience setting up or working with CI/CD pipelines and infrastructure tools like Terraform • Experience with Go or an interest in learning it • Experience writing technical design documents or architecture proposals • Experience working on platform-driven development or building developer tools (DevTools) Why you should join SumUp: 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🧑‍🔬 We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks. 🌈 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 📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education 🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success 💶 A corporate pension scheme where we match up to 20% of your contributions 🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp 🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team 🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of 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. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind. About us: 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 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. 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. Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website, and follow our journey 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.