Fullstack Engineer

Location: Copenhagen, 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 for a fullstack engineer who can own end to end delivery work across both the frontend and backend. 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 full stack features across the Expenses and MTD products, working across the React.js frontend and Node.js/TypeScript backend * Contribute to the major initiative to integrate Expenses directly into the Business Account transaction history, including API refactoring and frontend changes * Take ownership of backend service reliability within the squad, including CI/CD workflows, Kubernetes deployments, and observability tooling * Collaborate with Product, Design, and cross-functional squads to deliver clean, testable, and maintainable code, with a focus on user experience * Participate in code reviews, contribute to architectural decisions, and help evolve the squad's engineering practices YOU'LL BE GREAT FOR THIS ROLE IF… * Solid proficiency in Node.js and TypeScript, with a track record of building and maintaining microservices * Hands-on experience with React.js and a history of delivering maintainable, user-facing frontend features * Comfortable working in a small, autonomous squad where ownership is expected from day one * Experience reasoning about API design, incremental migration paths, and architectural trade-offs, including familiarity with event-driven concepts and tools such as Kafka or RabbitMQ * Clear and confident communication skills, with the ability to articulate technical decisions and feedback to product, design, and cross-functional partners * You 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 attend global offsites, trips and/or hackathons (2023, 2024, 2025 and counting) 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. 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.

About myTomorrows  myTomorrows is a global health tech company dedicated to breaking down barriers for patients seeking treatment options.    We strive to enable earlier and better treatment access by bridging the gap between those searching for possible options, and the companies who develop them. We work closely with patients, healthcare professionals, trial sites, patient advocacy groups, and BioPharma – connecting key stakeholders in the drug development ecosystem.    We’ve developed a cutting-edge AI-powered technology platform that simplifies and streamlines access to drugs in development. To support our users and clients, we have a range of industry-expert specialized teams ready to help. Our services include clinical trial patient recruitment, Expanded Access Program management and Real-World Data collection.    With a global footprint spanning 134 countries, to date we’ve supported over 17,000 patients, 3,000 physicians and 350 sites, earning the trust of 60+ BioPharma companies. In October 2025, we closed a €25M investment with Avego Healthcare Capital to fuel our global ambitions and scale the business.   Join us in shaping the future of treatment access - making tomorrow’s therapies accessible for people who need them today.  The opportunity: Fullstack Engineer As a Full Stack Engineer, you will take primary ownership of our frontend experience while being capable of making the backend changes needed to unblock yourself and your team. You'll work closely with Backend Engineers, DevOps Engineers, and stakeholders to deliver scalable, reliable, and high-performance products end-to-end, from pixel to API. Given that most of our team is located in the Netherlands, we only consider candidates for this position who live within commuting distance of our office in Amsterdam. WHAT YOU'LL DO IN THIS ROLE * Design, develop, and maintain frontend components in Angular (and Lit HTML where applicable), ensuring optimal performance, responsiveness, and usability. * Own the integration layer between frontend and backend: consume and contribute to OpenAPI-defined APIs, handle data contracts, and wire up microservices cleanly. * Make targeted backend changes, new endpoints, tweaks to existing services, minor data model updates, so you can ship features without always depending on a dedicated backend engineer. * Contribute to architectural discussions across the full stack, from UI component structure to API design and data access patterns. * Participate actively in code reviews, providing feedback on both frontend and backend code quality, adherence to standards, and performance. * Mentor and support junior engineers across the stack. * Stay current with evolving frontend and full-stack best practices. WHAT YOU BRING TO THE TABLE * 3+ years of experience in frontend or full stack engineering. * Strong proficiency in Angular and experience with component-based frameworks such as Lit HTML. * Solid understanding of responsive design, UX/UI principles, and a keen eye for design detail. * Proven experience integrating with APIs and microservices, you understand HTTP, REST conventions, auth flows, and error handling deeply. * Working proficiency in Python, enough to navigate a FastAPI codebase, add or adjust endpoints, and write Pydantic models and SQLAlchemy queries. * Familiarity with relational databases (MySQL/PostgreSQL) at the query and schema level. * Experience with containerised workflows using Docker. * Excellent problem-solving skills; comfortable working independently and collaboratively. * Strong English communication skills and ability to work across disciplines. * Comfortable using AI-assisted development tools (e.g. Claude Code, Cursor, or similar) as part of daily workflow. * Familiarity with LLM API integration (OpenAI, Anthropic, or similar) and an understanding of the UX patterns specific to AI-powered features. WHAT SUCCESS IN THE FIRST 6 MONTHS LOOKS LIKE * You've built trust with Backend, DevOps, and Product peers and taken clear ownership of 2–3 frontend domains, including their design system consistency and API integration contracts. * You've delivered frontend features end-to-end, from UX design discussion through Angular implementation, API wiring, tests, and documentation, without needing hand-holding at either layer. * You've unblocked yourself (and others) by making safe, well-reviewed backend changes: adding an endpoint, adjusting a response model, or optimising a query, rather than waiting in a queue. * You've raised frontend quality: responsive across devices, accessible, consistent with our design system, and validated against real API contracts rather than mocks. * You've contributed to meaningful observability on the frontend, error tracking, performance budgets, and linked them to backend SLIs where relevant. * You've shared knowledge through documentation, code reviews, and mentoring, so the team's frontend capability grows with you. CURRENT TECH STACK We're fully cloud-native on AWS, with a lean, API-first product development approach. Frontend: Angular · Lit HTML · Headless Wagtail · WordPress Backend: Python · FastAPI · Pydantic · SQLAlchemy · MySQL · Neo4j Platform: AWS · Kubernetes · Terraform · Docker · GitHub Actions · ruff · UV · pre-commit · Renovate Our platform runs on Kubernetes-managed services and Terraform for infrastructure as code. We continue expanding capabilities in knowledge graphs (Neo4j) and modern data access patterns. What we offer: * Impactful work that helps patients gain access to potentially lifesaving treatments.  * International work environment, scale-up energy and a flat organizational structure that encourages creativity and accountability.  * Competitive salary, annual performance bonus and an Employee Stock Option Plan.  * Great career development opportunities in a fast-growing company.   * Learning and development budget alongside internal knowledge sharing sessions.  * Attractive pension plan, full premium covered by myTomorrows.  * Hybrid working model.  * Policies to support working parents.  * Healthy lunch at the thriving Amsterdam office.   * Unlimited access to professional guidance by certified psychologists via OpenUp   * Enjoy monthly events hosted by our vibrant Culture Club as well as an annual ‘myTomorrowland’ company-wide celebration!  Equal opportunities myTomorrows is an Equal Opportunity Employer and, beyond upholding discrimination-free practices, we are committed to cultivating a workplace where difference and diversity are protected and celebrated. The best work comes from our best selves, and we go to great lengths in supporting our team members to be just that.