Senior Software Engineer, Online
Fuld tid
FLATPAY ApS
About the job
Flatpay has become one of the fastest-growing payment companies by helping merchants accept payments in-store. Now we're taking the next step. Online is one of Flatpay's newest and most strategic engineering domains. We're building the products and platforms that enable merchants to accept payments online and grow their businesses in the digital economy.As a Senior Software Engineer, you'll play a key role in defining the technical direction of Flatpay's online platform and helping establish the technical and architectural foundations that will support the next phase of Flatpay's growth. This is a unique opportunity to join at an early stage. While Flatpay already serves merchants at scale, our online platform is still in its early stages. You'll have the opportunity to help launch new solutions, shape how the platform evolves as adoption grows, and learn directly from customers along the way. If you enjoy building products from the ground up, working close to customers, and seeing your work evolve from first launch to large-scale adoption, you'll have the opportunity to make a significant impact in a domain that will play an important role in Flatpay's future growth.
What you'll do
- Design and build scalable systems that power online payments and commerce experiences
- 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 integrations that enable online payment experiences
- Improve reliability, observability, performance, and security across the platform
- Partner with engineers, product managers, and stakeholders to drive technical and product outcomes
- Mentor engineers through coaching, code reviews, and knowledge sharing
- Help establish engineering standards and best practices as the Online 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
- Comfortable navigating ambiguity and helping shape new products and systems
- Strong communication and collaboration skills
- Experience within payments, fintech, e-commerce, SaaS, or high-scale transaction systems is a plus
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
- 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.
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