Fullstack Developer -.NET 9 & React (m / f / d)

About us

Optimus 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.

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Tasks

• Design, develop, and document the architecture of a newly acquired product and integrate standardised 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.

Profile

• 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 (B1 minimum) and solid English skills (C1 level).

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