Senior Principal .NET Developer

We are seeking a Senior Principal Developer with strong technical expertise and a drive to shape modern, scalable systems. This is an opportunity to work at the centre of Saxo’s platform, where your decisions will directly influence reliability, performance, and long-term architecture.

The Back Office Core team builds the foundation of our post-trading systems. Every line of code and every system architecture we create ensures trust, drives efficiency, and secures the accurate financial state of our platform. We are, in many ways, the heartbeat of post-trading operating at the core of a global, revenue-critical environment.

You will collaborate closely with senior post-trading developers across locations and play a key role in mentoring engineers, influencing engineering standards, and guiding architectural direction. Based in our Copenhagen headquarters, you will also work in a global setup alongside our engineering teams in India.

At Saxo, you will not just build systems you will help define how we evolve them.

Responsibilities

In this role, you will take ownership of both building and evolving critical systems, working hands-on while contributing to long-term architectural direction.

Your Responsibilities Will Include

• Building scalable, high-performance solutions using C#/.NET and .NET Core
• Designing and maintaining RESTful and gRPC APIs with clear, business-aligned contracts
• Working across event-driven and service-oriented architectures in a distributed environment
• Maintaining and optimising SQL Server databases, including performance-critical and legacy DB-centric components
• Driving the modernisation of legacy systems, transitioning towards loosely coupled, scalable architectures
• Ensuring high standards of reliability, correctness, observability, and performance in revenue-critical systems
• Contributing to architecture decisions, engineering standards, and platform evolution
• Facilitating entity-based communication using Kafka
• Taking ownership of production systems, including monitoring, troubleshooting, and incident follow-up

Your profile

You are a highly experienced backend engineer who thrives in complex environments and takes pride in building systems that are both robust and scalable. You bring a combination of deep technical expertise, a proactive mindset, and a collaborative approach to problem-solving.

We Imagine That You

• Have 10–12 years of experience and a strong track record in software engineering
• Bring deep expertise in C#/.NET and SQL programming
• Have a solid understanding of microservices architecture and distributed systems
• Ideally have experience with Kafka or similar event streaming technologies
• Are detail-oriented, proactive, and comfortable working close to production systems
• Enjoy mentoring others and influencing technical direction across teams
• Are adaptable, curious, and motivated by continuously improving both systems and ways of working

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!