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 .

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).