Software Engineer, Online

ABOUT THE JOB Flatpay has become one of the fastest-growing payment companies by helping merchants accept payments in-store and online. But with 100,000+ merchants relying on us today, payments are only part of running a business — every transaction eventually needs to land in the books, and that's still far too much manual work. Accounting and Bookkeeping is one of Flatpay's most strategic engineering domains. We're building the products and platforms that turn transaction data into clean books and accurate financial records — including integrations with the accounting systems our merchants already use. As a Senior Software Engineer, you'll play a key role in defining the technical direction of Flatpay's accounting platform — from how we model financial data, to how we build systems that handle real-world bookkeeping at scale and connect reliably with the third-party systems on the other end.This is an opportunity to join a company that has grown from startup to unicorn at record speed. You'll have significant ownership, the freedom to drive technical decisions, and a direct impact on tools that 100,000+ businesses can rely on. As we expand across markets — each with its own accounting practices, tax rules, and reporting requirements — you'll help shape how Flatpay scales financial infrastructure. If you care deeply about the accuracy financial data demands, this is a domain where your work will play a central role in Flatpay's future growth. WHAT YOU'LL DO * Design and build scalable systems that power Flatpay's accounting and bookkeeping capabilities * Lead feature and platform initiatives involving multiple engineers, driving delivery from discovery through production * Take ownership of features from design and implementation through deployment and maintenance * Drive architectural decisions and long-term technical improvements * Build APIs, services, and data models that handle financial data accurately and at scale * Improve reliability, observability, performance, and security across the platform — with particular attention to the accuracy and consistency that financial data requires * Partner with engineers, product managers, and stakeholders to drive technical and product outcomes * Help establish engineering standards and best practices as the Accounting and Bookkeeping domain continues to grow WHO YOU ARE * 7+ years of professional software engineering experience * Strong experience designing and operating distributed systems * Demonstrated ability to lead technical projects involving multiple engineers and influence architectural decisions * Experience building scalable backend platforms and APIs, especially ones that integrate with internal and third-party systems * Comfortable navigating ambiguity and helping shape new products and systems * Strong communication and collaboration skills * Experience within payments, accounting and bookkeeping systems, or financial data platforms is a plus You'll be working with technologies such as the following. We don't expect experience with every technology listed below. We're looking for engineers who can learn quickly and help us build great products. Backend * Java, Spring Boot * MySQL * REST APIs & Event-Driven Architecture * Domain Driven Design * Docker, AWS Frontend * TypeScript * React * TanStack Query * Jest * Playwright * i18n, feature flags Platform & Delivery * GitHub Actions * CI/CD * AWS ECS * Observability & Monitoring WHY FLATPAY? As part of our team, you'll join 2,000+ passionate Flatpayers dedicated to shaping the future of payments. You'll help build a strategic new business area from the ground up, working on products that directly connect merchants and consumers while shaping the future of online payments at Flatpay. We offer an inclusive environment where engineers are trusted with ownership and encouraged to make an impact. Our engineering teams work together from our Copenhagen office. We believe that close collaboration, quick feedback loops, and solving problems side-by-side help us build better products, move faster, and create a stronger engineering culture. We also provide plenty of perks including free slush ice, an on-site gym, a fully equipped gamer room, and much more. If you're ready to help build and scale the future of payments, we'd love to hear from you.

Join AutoProff – Help Shape the Future of Automotive Tech! We seek a new colleague to join our talented Technology team based at our Copenhagen office. At AutoProff, we believe great technology drives great experiences - and we’re just getting started. We’re on a mission to transform the way vehicles are traded across Europe, and we need curious and driven new colleagues to help us do it. As our new Software Engineer, you’ll join a cross-functional team focused on the Fulfillment & FinTech domain, where we build and evolve critical post-trade services in a B2B environment. Our team owns key capabilities such as logistics orchestration, transport partner integrations, payment touchpoints, invoicing visibility, and claims handling, ensuring seamless and transparent operations after a transaction is completed. Working closely with product, operations, and external partners, you’ll help design and deliver robust, scalable solutions that connect multiple systems and stakeholders, directly impacting the efficiency and reliability of our platform for customers across Europe. We foster a developer-friendly culture where innovation isn’t just encouraged, it’s expected. You’ll have access to modern, AI-powered tools to enhance productivity and streamline your daily work. We host hackathons to explore new tech, ideas and tools, and our internal developer forums are open spaces for discussing architecture, new technologies, and tough engineering challenges. Whether building or learning, there's always room to experiment and grow. Let's dive into your key responsibilities, you will * Work in a dynamic and international environment with experienced and skilled colleagues * Design, develop, and maintain efficient, reusable, and reliable code using engineering best practices and design patterns. * Drive a culture of “you build it - you own it” - mentality * Identify and act on areas for your own personal development * Mentor and coach co-workers on topics that you master. The need-to-have skills * Proven ability to thrive in environments that value adaptability, shared ownership, and continuous improvement * Experience working with .NET and C# * Strong understanding of object-oriented programming, distributed systems and event-driven architecture. * Experience with relational databases or No-SQL databases * Good communication skills and fluency in business English (spoken and written) * Open towards and able to quickly learn new technologies * Ability to troubleshoot problems, debug and suggest solutions The nice-to-have skills * Experience working with AWS Infrastructure or other cloud providers, especially containerization and serverless computing. * Experience with RESTful APIs We’re eager to hear from you! If this sounds like a great match and sparks your interest, don’t wait, apply today! About AutoProff AutoProff was founded 2013 in Denmark with the aim to digitise B2B used car trading, helping car dealers increase sales and improve profits.  In August 2022, AutoScout24, the leading specialised pan-European online car marketplace, acquired a majority stake in AutoProff. The partnership has supported the rapid expansion of AutoProff's solutions across Europe and enables the creation of Europe's first fully integrated C2B-B2B-B2C dealing solution for used cars.  At AutoProff, we specialise in providing online B2B used-car dealing solutions designed to improve the buying and selling experience for professional car dealers and their customers. We are the emerging European leader with more than 150,000 B2B used cars on our online trading platforms annually.    With a focus on effective solutions, digitisation and customer service, we are committed to being the home of B2B car dealing for European car dealers.