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

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

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 Senior 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 Aachen, Bremen, and Köln.

Your Responsibilities as a Senior Fullstack Developer

• 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.

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) .
• Willingness to take operational responsibility within the team.
• Fluency in German (C1 minimum) and solid English skills (also C1 level).

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Engineering, Information Technology, and Administrative
• Industries: IT System Custom Software Development