Senior software Engineer, Internal tools

About the role

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. This 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. Design and deliver scalable, maintainable, and high-quality solutions that drive business impact
Enhance and evolve core internal systems to improve reliability, performance, and user experience
Continuously optimize CI/CD pipelines and infrastructure to accelerate delivery and increase stability
Collaborate closely with internal stakeholders to shape ideas, define requirements, and turn them into actionable plans
Lead cross-functional projects from concept to successful delivery
Mentor and support team members, fostering technical growth and engineering excellence
Drive architectural improvements and champion best practices to ensure the platform scales for the future
5+ 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
Comfortable navigating ambiguity with pragmatism and helping shape new products and systems
Strong communication and collaboration skills
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
Platform & Delivery
GitHub Actions
CI/CD
AWS ECS
Observability & Monitoring
Feature flags
You’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. 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 are ready to be part of this exciting journey, we would love to hear from you today.