{"id":2603593,"url":"https://alion.io/job/flatpay-senior-software-engineer-internal-tools","title":"Senior Software Engineer, Internal Tools","company":{"id":1936002,"name":"Flatpay","domain":"flatpay.com","url":"https://alion.io/company/flatpay-com","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Personio","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Herlev, Denmark"],"countries":["DK"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":66000,"max_usd":194000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":6933},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Amazon ECS","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"Docker","optional":false},{"name":"GitHub Actions","optional":false},{"name":"Java","optional":false},{"name":"Jest","optional":false},{"name":"MySQL","optional":false},{"name":"Playwright","optional":false},{"name":"React.js","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Boot","optional":false},{"name":"TypeScript","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-10-14T22:00:00Z","employer_posted_date":null,"last_verified_at":"2026-10-14T22:00:00Z","board_verified":false,"closed_at":null,"days_open":1,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":1},"description":"**About The Job\n\n**You’ll be joining a high-performing and rapidly expanding team of engineers at one of Denmark’s fastest-growing companies. Together, we’re building and scaling the internal platforms that power our growth—including CRM system, sales tools, and operational software used daily and enabling our commercial organization to operate efficiently at scale as we continue our European expansion.\n\nThis is an opportunity to be part of a company that has grown from startup to unicorn at record speed. As we continue to expand into new markets and serve an ever-growing customer base, you’ll work on challenges that come with operating products at scale. You’ll have significant ownership, the freedom to drive technical decisions, and a direct impact on the solutions used by businesses every day. As we grow, so will your opportunities to develop your skills, take on new responsibilities, and help shape the future of commerce across Europe.\n\nWhat you'll do\n\nDesign and deliver scalable, maintainable, and high-quality solutions that drive business impact\n\nEnhance and evolve core internal systems to improve reliability, performance, and user experience\n\nContinuously optimize CI/CD pipelines and infrastructure to accelerate delivery and increase stability\n\nCollaborate closely with internal stakeholders to shape ideas, define requirements, and turn them into actionable plans\n\nLead cross-functional projects from concept to successful delivery\n\nMentor and support team members, fostering technical growth and engineering excellence\n\nDrive architectural improvements and champion best practices to ensure the platform scales for the future\n\nWho you are\n\n5+ years of professional software engineering experience\n\nStrong experience designing and operating distributed systems\n\nDemonstrated ability to lead technical projects involving multiple engineers and influence architectural decisions\n\nExperience building scalable backend platforms and APIs\n\nComfortable navigating ambiguity with pragmatism and helping shape new products and systems\n\nStrong communication and collaboration skills\n\nWe don't expect experience with every technology listed below. We're looking for engineers who can learn quickly and help us build great products.\n\n**Backend\n\n**\n\nJava, Spring Boot\n\nMySQL\n\nREST APIs & Event-Driven Architecture\n\nDomain Driven Design\n\nDocker, AWS\n\n**Frontend\n\n**\n\nTypeScript\n\nReact\n\nTanStack Query\n\nJest\n\nPlaywright\n\ni18n\n\n**Platform & Delivery\n\n**\n\nGitHub Actions\n\nCI/CD\n\nAWS ECS\n\nObservability & Monitoring\n\nFeature flags\n\nWhy Flatpay?\n\nYou’ll help build and scale our internal platform, creating tools that empower teams across Flatpay and shape the future of how we operate, and scale our products.\n\nWe 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 are ready to be part of this exciting journey, we would love to hear from you today.\n\nEstablished in 2022 in Copenhagen with a commitment to transparency, we've streamlined card payments to small and medium-sized businesses. Our innovative pricing model eliminates hidden costs and fees, offering a simple flat rate for all cards with no monthly subscription for our point-of-sale and payment solutions.\n\nOperating in Denmark, Finland, Germany, Italy, France, the United Kingdom, and the Netherlands, we're more than just a service provider; we are your trusted business partner.\n\nWe continuously strive to stay ahead of the curve, adapting our solutions to meet our clients' evolving needs. 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