Senior .NET Developer (C#)

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!