Senior Software Engineer, Accounting & Bookkeeping

Skip to main contentBack to all jobsSenior Software Engineer, Accounting & BookkeepingCopenhagenFull-timePermanent employeeApply for this jobAbout the jobFlatpay 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 doDesign and build scalable systems that power Flatpay's accounting and bookkeeping capabilitiesLead feature and platform initiatives involving multiple engineers, driving delivery from discovery through productionTake ownership of features from design and implementation through deployment and maintenanceDrive architectural decisions and long-term technical improvementsBuild APIs, services, and data models that handle financial data accurately and at scaleImprove reliability, observability, performance, and security across the platform — with particular attention to the accuracy and consistency that financial data requiresPartner with engineers, product managers, and stakeholders to drive technical and product outcomesHelp establish engineering standards and best practices as the Accounting and Bookkeeping domain continues to growWho you are7+ years of professional software engineering experienceStrong experience designing and operating distributed systemsDemonstrated ability to lead technical projects involving multiple engineers and influence architectural decisionsExperience building scalable backend platforms and APIs, especially ones that integrate with internal and third-party systemsComfortable navigating ambiguity and helping shape new products and systemsStrong communication and collaboration skillsExperience within payments, accounting and bookkeeping systems, or financial data platforms is a plusYou'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.BackendJava, Spring BootMySQLREST APIs & Event-Driven ArchitectureDomain Driven DesignDocker, AWSFrontendTypeScriptReactTanStack QueryJestPlaywrighti18n, feature flagsPlatform & DeliveryGitHub ActionsCI/CDAWS ECSObservability & MonitoringWhy 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...