Fullstack Engineer (Backend focus: Node)

Location: Copenhagen office, Denmark The Global Bank tribe at SumUp, builds the financial tools that help small businesses manage their money more confidently, including Expenses and Making Tax Digital, two products that sit at the heart of SumUp's accounting and compliance offering. In this role you will join a small, senior squad, at a genuinely exciting moment: we starting with Making Tax Digital in the UK, where merchants can now submit Income Tax assessments digitally, SumUp's vision is to expand this into a full suite of Accounting tools - covering Income Tax assessment, VAT submission, and financial reporting across multiple markets. This is genuinely early-stage, high-impact work, and the Expenses and MTD squad is where it begins. We are looking primarily for a Node.js backend engineer who can also contribute to React.js frontend work when needed. You'll work closely with two senior engineers, a Product Manager, a Designer, and an Engineering Manager - with the reach and resources of a global 200 person tribe behind you, and product impact at scale. What you'll do Build and maintain backend services and APIs for the Expenses and MTD products using Node.js and TypeScript Contribute to backend development and API design, including building and refactoring services to support evolving product requirements Contribute actively to backend services reliability within the squad, including CI/CD workflows, Kubernetes deployments, monitoring, and observability tooling Collaborate with Product, Design, and cross-functional squads to deliver scalable, testable, and maintainable code Participate in code reviews, contribute to architecture and technical decisions, and help evolve the squad's engineering practices Contribute to the React.js frontend when needed by building and improving user-facing features and integrating backend APIs You'll be great for this role if you… Have solid proficiency in Node.js and TypeScript, with a track record of building and maintaining microservices Can contribute to user-facing frontend features in React.js Are comfortable working in a small, autonomous squad where ownership is expected from day one Have can reason about API design and architectural trade-offs, including familiarity with event-driven concepts and tools such as Kafka or RabbitMQ Can communicate clearly and confidently, and articulate technical decisions and feedback to product, design, and cross-functional partners Are curious about this domain and are a continuous learner Why you should join SumUp 🌎 Opportunity to work with 3000+ SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Copenhagen office (Vesterport station (within 5 mins walking distance to Copenhagen central station). 🌈 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 onto our Virtual Stock Option programme: you will own a stake in SumUp's future success 📚 A dedicated annual L&D budget of €2,000 for your individual development, which can be used to attend conferences and/or advance your career through further education 🏥 Health insurance and life insurance (available after 3 months of employment) 💼 Company Pension Scheme: SumUp contributes 9% and you contribute 4.5% (available after 3 months of employment) 🚆 DSB Business Commuter Card available via pre-tax salary 🥗 Subsidised meals in the office canteen 📱 Smartphone and subscription provided by SumUp ❤ Mental well-being support: access to licensed psychotherapists through SumUp Sessions, our confidential Employee Assistance Programme 🌴 Break4me: 1-month sabbatical after 3 years of service 🎉 Special leave days for life moments that matter, including birthdays, weddings, bereavement, and volunteering 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team 🤖 You’ll at…