Senior Principal .NET Developer (Copenhagen)

Job summary

This role involves shaping modern, scalable systems as a Senior Principal Developer, focusing on the core of post-trading systems. You will have a significant impact on reliability, performance, and architecture while collaborating with teams across locations.

Responsibilities

• Take ownership of building and evolving critical systems while contributing to architectural direction.
• Develop scalable, high-performance solutions using C#/.NET and .NET Core.
• Design and maintain RESTful and gRPC APIs with business-aligned contracts.
• Work within event-driven and service-oriented architectures in a distributed environment.
• Optimize SQL Server databases, including performance-critical components.
• Modernize legacy systems towards loosely coupled architectures.
• Ensure reliability, correctness, observability, and performance in revenue-critical systems.
• Contribute to architecture decisions and engineering standards.
• Facilitate entity-based communication using Kafka.
• Manage production systems, including monitoring and incident follow-up.

Qualifications

• 10–12 years of experience in software engineering.
• Deep expertise in C#/.NET and SQL programming.
• Strong understanding of microservices architecture and distributed systems.
• Experience with Kafka or similar event streaming technologies is a plus.
• Detail-oriented and proactive, comfortable near production systems.
• Enjoy mentoring and influencing technical direction.
• Adaptable and motivated to improve systems and processes.

Education

• Relevant degree in Computer Science or a related field is preferred.

Tools

• C#/.NET, .NET Core, SQL Server, Kafka, RESTful APIs, gRPC.