About usOptimus Search has partnered with one of Germany’s leading product-based companies focused on energy efficiency and the reduction of CO₂ emissions, contributing to a more sustainable future. Due to significant success over the past five years, the company is currently in a phase of hyper-growth, offering a clear path for career advancement. They are now seeking Fullstack .NET Developers to join newly formed teams responsible for modernising legacy systems and building a new software architecture using the latest .NET 9 technology. The company has offices in Giessen, Koblenz, and Berlin.TasksDesign, develop, and document the architecture of a newly acquired product and integrate standardised software solutionsExtract components from a legacy system and migrate them to modern, cloud-based platformsCoordinate and manage system interfaces in collaboration with cross-functional teamsEngage in full-stack development using C#.NET 9, ASP.NET Core, EF Core, Angular 19, RxJS, NgRx, REST, microservices, and Azure cloud servicesDevelop loosely coupled, resilient architectures designed for long-term scalabilityProfileA passion for software engineering in a cloud-native environmentHands-on experience with Domain-Driven Design (DDD)Strong focus on code quality and test-driven development (TDD)Excellent communication skillsWillingness to take operational responsibility within the teamFluency in German (B1 minimum) and solid English skills (C1 level)