Senior Fullstack Engineer - Operations Platform

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 LD 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 ... (truncated, view full listing at source)