.NET / C# Developer (REF5243Z)

Actively Reviewing the Applications

Deutsche Telekom IT Solutions HU

On-site

Posted 3 weeks ago • Apply by June 14, 2026

Job Description

Company Description

As Hungary’s most attractive employer in 2025 (according to Randstad’s representative survey), Deutsche Telekom IT Solutions is a subsidiary of the Deutsche Telekom Group. The company provides a wide portfolio of IT and telecommunications services with more than 5300 employees. We have hundreds of large customers, corporations in Germany and in other European countries. DT-ITS recieved the Best in Educational Cooperation award from HIPA in 2019, acknowledged as the the Most Ethical Multinational Company in 2019. The company continuously develops its four sites in Budapest, Debrecen, Pécs and Szeged and is looking for skilled IT professionals to join its team.

Job Description

About the Project: You will be joining the RCS3 project, operating within the IT Service Management (ITSM) and Application Management (AM) domain for the telecommunications and network infrastructure sector.

RCS3 is a critical, core process application used by our specialized department to configure, manage, and deliver network components such as routers and switches. The application runs on the Telekom Private Cloud (TPC) / Future Cloud Infrastructure. Our technology stack is heavily built on the .NET ecosystem (C#, Blazor) and integrates Keycloak, API Management, and Expect Scripting.

Role Overview: We are looking for a skilled .NET / C# Developer to join our team. In this role, you will be responsible for developing, maintaining, and scaling the RCS3 application. Since this is a critical tool for network component delivery, you will play a key role in building secure, high-performing, and reliable features that directly impact our core operational processes.

Key Responsibilities:

Design, develop, and maintain backend services and APIs using C# and ASP.NET Core.
Build interactive and responsive user interfaces utilizing Blazor and the MudBlazor component library.
Implement data access layers and manage database interactions using Entity Framework.
Write clean, scalable, and maintainable code, actively participating in code reviews and architectural discussions.
Integrate the application with third-party systems, including Keycloak, API Management tools, and Expect Scripting.
Deploy and support the application running on the Telekom Private Cloud (TPC).

Qualifications

Required Skills & Qualifications:

Strong C# / .NET skills: Solid professional experience in software development using C# (ideally with knowledge of .NET 8 or newer).
Web Frameworks: Proven experience in building web applications and RESTful APIs using ASP.NET Core.
Database Knowledge: Solid understanding of database fundamentals, HTTP protocols, and hands-on experience with relational databases, specifically MariaDB.
ORM Frameworks: Practical knowledge and experience with Entity Framework.

Additional Information