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

Optimus Search; Köln; Vor Ort; EUR 50.000 - 70.000; Vollzeit

Zusammenfassung

A leading product-based company in Germany is seeking Fullstack .NET Developers to join teams focused on modernizing legacy systems and building new software architecture using .NET technology. Responsibilities include designing architecture, migrating components to cloud platforms, and engaging in full-stack development. Candidates should be passionate about software engineering and fluent in German, with strong English skills. Opportunities for career advancement are available.

Aufgaben

• Design and document the architecture of a newly acquired product.
• Migrate components from a legacy system to modern cloud platforms.
• Manage system interfaces with cross-functional teams.
• Engage in full-stack development using modern technologies.
• Develop scalable architectures for long-term use.

Kenntnisse

Software engineering passion

Domain-Driven Design (DDD)

Code quality focus

Test-driven development (TDD)

Excellent communication skills

Operational responsibility

Fluency in German (B1)

Solid English skills (C1)

Tools

.NET 9

C# .NET

ASP.NET Core

EF Core

Angular 19

RxJS

NgRx

REST

Microservices

Azure cloud services

Jobbeschreibung

About us

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).