Senior .NET Developer (C#)
External
Saxobank · HeadquartersPrepare for this interview
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About the role
We are looking for a Senior Backend .NET Developer to join our Plat form 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 integration s 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 ‑ up s
- 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
- Your profile
- 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
Benefits
Additional Information
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.
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