Senior .NET Developer (Legacy Specialist & AI Expert)
Employer · Deutsche Telekom
Software developerApplications developerFull-timeDebrecen
Deutsche Telekom IT Solutions is looking for a Senior .NET Developer to join an initiative focused on the evolution and modernization of the Internal Application Landscape. This project involves the strategic transition of well-known cloud services and legacy .NET architectures into a next-generation, AI-augmented, and cloud-native software landscape.
Tasks
- Design and implement sophisticated new functionalities within the existing .NET ecosystem, ensuring seamless integration with legacy components.
- Analyze and deconstruct complex, undocumented, or "spaghetti" legacy code to understand underlying business rules and technical flows.
- Proactively utilize AI coding assistants and advanced environments to accelerate code comprehension, documentation, and refactoring.
- Write high-quality unit and integration tests to "wrap" legacy modules, providing a safety net for all refactoring efforts.
- Act as a high-level escalation point for complex bugs and performance bottlenecks within the legacy environment.
- Utilize Microsoft PowerApps to build rapid, lightweight administrative or maintenance utilities to support the development and operations lifecycle.
Conditions & benefits
Continuous development across four sitesThe company continuously develops its four sites in Budapest, Debrecen, Pécs and Szeged and is looking for skilled IT professionals.Remote working possibilityRemote working possibility is available within Hungary due to European taxation regulation.
Requirements
- 6 years of professional software development experience, with deep expertise in the .NET/C# stack.
- Proven experience working with older .NET versions (e.g., .NET Framework) and managing the complexities of monolithic architectures.
- Hands-on familiarity with AI coding assistants, prompt engineering, or local model experimentation.
- Mastery of SOLID principles, design patterns, and advanced debugging/profiling techniques.
- Strong commitment to TDD and automated testing (Unit/Integration) to protect the legacy core.