Senior .NET Fullstack Developer position available in Copenhagen. Responsibilities include designing, developing, and maintaining back-end systems using .NET technologies, creating and managing RESTful APIs, collaborating with cross-functional teams, optimizing applications for speed and scalability, and troubleshooting. Must have strong experience with .NET framework, Azure services, and REST API design, along with fluent Danish communication skills. Nice to have knowledge of front-end technologies like HTML, CSS, and JavaScript. Full-time role with an ASAP start date, duration of 1-3 months, and 100% onsite work.