Backend Software Developer C# (m/w/d)

About usOptimus Search has partnered with an industry leading organisation and Microsoft Gold Partner status within the Healthcare Sector that maximises the effectiveness of crucial monetary CRM solutions. This forward-thinking firm supports their customers in a world of rapid digital, monetary and physical change. As well as their esteemed position in the industry, they are also a leader in employee satisfaction; boasting an impressive 4.8 stars on Kununu Reviews!Following a successful 2025, they are continuing this upward trajectory into the new year and are looking to onboard multiple experienced Backend C#.NET Developers for their Köln office.TasksDesign and develop high-quality applications using C# and the latest technologies in the tech stack, including ASP.NET Core (.NET 8/9), Kubernetes Clusters, REST, and MongoDB.Manage source code repositories and contribute to version control processes using Git/GitLab.Develop and maintain scalable and efficient microservices architectures.Drive end-to-end (E2E) testing to ensure application quality and reliability.Contribute to the continuous improvement of the development process in an agile Scrum environment.ProfileSuccessfully completed degree in IT or comparable training.Ideally, you have at least three years professional experience.You are experienced in application development with C# and fit our tech stack: ASP.NET Core (.net 8/9), C#, Kubernetes Cluster, REST, Mongo DB, Git / GitLab, Workflow and decision automation platform for microservices orchestration.You have gained experience in a dynamic and agile working environment.German Language requirement - B1 minimum.