OOptimus 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 Senior Fullstack .NET Developers to join newly formed teams responsible for modernizing legacy systems and building a new software architecture using the latest .NET 9 technology. The company has offices in Aachen, Bremen, and Köln.

Your Responsibilities as a Senior Fullstack Developer:

• Design, develop, and document the architecture of a newly acquired product and integrate standardized software solutions
• Extract components from a legacy system and migrate them to modern, cloud-based platforms
• Coordinate and manage system interfaces in collaboration with cross-functional teams
• Engage in full-stack development using C#.NET 9, ASP.NET Core, EF Core, Angular 19, RxJS, NgRx, REST, microservices, and Azure cloud services
• Develop loosely coupled, resilient architectures designed for long-term scalability

What We’re Looking For:

• A passion for software engineering in a cloud-native environment
• Hands-on experience with Domain-Driven Design (DDD)
• Strong focus on code quality and test-driven development (TDD)
• Excellent communication skills
• Willingness to take operational responsibility within the team
• Fluency in German (C1 minimum) and solid English skills (also C1 level)