Copenhagen, Denmark
We believe access to global capital markets is not only for the privileged few. Our vision is to enable people to fulfill their financial aspirations to make an impact. That’s why we use the power of technology to deliver clients what they need, when they need it in a user-friendly and personalized experience.
About the job
We are looking for a Senior Backend .NET Developer to join our Platform Servers team located in our wonderful office located in Hellerup (a suburb of Copenhagen). You will help us strengthen our fintech platform, where reliability, correctness, and long-term maintainability are of utmost importance. Your job will be building and maintaining integrations in backend systems, developing secure APIs, and ensuring the stability of services.
You will work on systems that must remain operational, auditable, and scalable over long lifecycles, balancing new feature development with maintenance and continuous improvement of existing services.
Responsibilities
Design, develop, and maintain backend services using C# and .NET framework
Build, evolve, and support OpenAPI‑based services used by internal teams and external partners
Take responsibility for production systems, including monitoring, troubleshooting, and incident follow‑ups
Leverage the power of AI tooling and agentic engineering techniques
Maintain and extend Kafka‑based event streaming solutions with a focus on reliability and data consistency
Work with SQL databases, ensuring data integrity, performance, and traceability
Improve exiting code and systems through refactoring and incremental modernization
Collaborate with product, compliance, and DevOps teams to ensure systems meet fintech regulatory and operational requirements
Contribute to architectural decisions with an emphasis on stability, scalability, and operational excellence
How do you succeed
You know how to take ownership, from design through production, where uptime of services is not an afterthought. You approach existing code with pragmatism and are able to communicate clearly with stakeholders across product, compliance, and engineering, surfacing risks and trade-offs early. You stay curious about the domain and the platform - trying to understand why a service exists and how it fits into the broader picture.
Your profile
You are a seasoned backend engineer who thrives in complex environments where uptime and data correctness are a first-class citizen. You've built and maintained systems that real businesses depend on, and you understand that great software is measured not just by what it does, but by how confidently it can be operated, audited, and evolved. You're energized by hard problems — making a critical path more resilient or modernizing a legacy service without disrupting what's already working. You bring both technical depth and the judgment to know when "good enough" is the right call and when it isn't!
Required Qualifications
Extensive experience as a Senior .NET Developer working with C#
Strong background in building and maintaining RESTful APIs
Advanced SQL knowledge and experience with relational databases in production environments
Solid experience using Entity Framework / EF Core
Experience with Kafka or similar messaging/event‑driven platforms
Proven experience maintaining backend services that run in the cloud (AKS) as well as on-premises (Kubernetes on-prem, Windows Server)
Strong understanding of system observability, debugging, and performance optimization. We use the ELK stack together with Prometheus and Grafana
Experience with Azure DevOps Server or other CI/CD pipelines in tightly regulated environments
Ability to work with existing systems while introducing improvements safely and incrementally behind feature flags
Big Plus / Nice to Have
Background in white‑labeling and multi‑tenant B2B fintech solutions
Experience using AI tooling to accelerate development tasks (a.k.a. agentic development)
Experience managing large configurations and deployments
Familiarity with compliance‑driven development (e.g., auditability, traceability, rollback safety)
Experience operating systems with high availability and low tolerance for downtime
What We Offer
Work on systems where quality and reliability truly matter
Real ownership of services across their full lifecycle
An engineering culture that values clean code, maintainability, and correctness
Usage of AI and agenting development tools (Copilot, Opencode, etc with modern models)
Competitive compensation and benefits
Opportunities to influence platform stability, design of services and architecture
We get curious people invested in the world
When you work at Saxo, you become a Saxonian and part of a purpose-driven organisation, where good ideas are always taken seriously, and where you can make a true impact. We are invested in your development, and you can expect a robust career from day one when you join Saxo – no matter which role you take on.
You will join 2,500 other ambitious colleagues across 15 countries and become part of an international organisation. Working in Saxo, you will get to meet colleagues from many different cultures and backgrounds, and you should know that we value diversity and inclusion and see it as a genuine source of strength to drive growth, foster innovation and position us for long-term success.
We encourage an open feedback culture and supportive team environments enabling employees to grow and fulfil their career aspirations.
When you bring passion, curiosity, drive and team spirit, your learning journey will be dynamic and your career opportunities in Saxo will be immense.
At Saxo we don’t just offer a job – we offer an opportunity to invest in your future!
How to apply :
Click here to create an account and upload your resume and a short motivation. We look forward to getting to know you better!
Skills Required
- Extensive experience as a Senior .NET Developer working with C#
- Strong background in building and maintaining RESTful APIs
- Advanced SQL knowledge and experience with relational databases
- Solid experience using Entity Framework / EF Core
- Experience with Kafka or similar messaging/event‑driven platforms
- Proven experience maintaining backend services that run in the cloud and on-premises
- Strong understanding of system observability, debugging, and performance optimization
- Experience with Azure DevOps Server or other CI/CD pipelines
What We Do
At Saxo we believe that when you invest, you unlock a new curiosity for the world around you. Discovering an intuitive desire within to actively learn, explore, and ask questions, you will engage with new companies, new communities, maybe even new countries. You could call this an appetite or passion for new knowledge and skills. We call it curiosity. Ultimately everything we do as a company is focused on getting curious people invested in the world by giving our clients more ways to make more of their money. We began in Copenhagen, Denmark in 1992 with a clear vision: to make the global financial markets accessible for more people. In 1998, we launched one of the first online trading platforms in Europe, providing professional-grade tools and easy access to global financial markets for anyone who wanted to invest. Today we are a well-capitalised Danish (EU) bank with top capital ratios and positive rating from S&P, trusted by over 1.2 million clients. As an international award-winning investment firm for investors and traders who are serious about investing, our clients enjoy regulated and reliable access to over 71,000 financial instruments on our industry-leading platforms. Keeping our headquarters in our beloved Denmark, we have expanded our reach to having more than 70 nationalities employed in offices in 14 countries. We are proud of our Scandinavian heritage and we are committed to the values of trust, fairness, and security. We believe this gives our clients the confidence to be adventurous and curious. Curiosity can lead you to places you never could have imagined. When you invest, you stimulate the mind, you see new perspectives, and you broaden your horizons. Personal transformation is inevitable as you develop a sincere interest and curiosity for not only the world, but also for others. At Saxo our greatest hope is for everyone to become engaged, to feel empowered, and to Be Invested
