You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Harald WilbertzHW

Harald Wilbertz

C# .Net Backend Developer

€740/day
Berlin, DE
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Harald

C# .Net Backend Developer

I have been working as a freelance software developer for over 31 years, first as a C++ programmer, then as a C# developer and occasionally as a Python programmer. The focus is clearly on the backend area, especially performance optimizations and integration projects.
  • German

    Native or bilingual

  • English

    Fluent

Can work on-site
Berlin (up to 50km), Hamburg (up to 100km), Frankfurt am Main (up to 100km), Köln (up to 100km), Leipzig (up to 100km), Hannover (up to 100km), München (up to 100km), Nürnberg (up to 100km)

Experience

  • HexaBase
    Software Developer
    DIGITAL AND IT
    May 2025 - Today (1 year and 1 month)
    Berlin, Germany
    The task was to develop a prototype of a RAG application that stores unstructured texts such as PDF documents in a vector database, thereby enriching the query context of queries against large language models like Chat GPT.
  • Card Assist
    High Speed Connector
    SOFTWARE PUBLISHING
    October 2023 - July 2024 (10 months)
    Berlin, Germany
    The task was to develop components for a high-speed connector according to Gematik specifications. This connector forms a central part of the telematics infrastructure. The focus of the task was the development of the event system, the interfaces to card readers and cards, cryptographic functions, and access operations for emergency data.

    C# C++ Microsoft Visual Studio ASP.NET Unit-Tests Angular Git Docker Web API 2 Telematikinfrastruktur
  • Medifox DAN GmbH
    Refactoring License Server
    SOFTWARE PUBLISHING
    May 2023 - August 2023 (4 months)
    Medifox uses a WCF-based license service in its software. This service was to be replaced by a new REST-based interface. These server-side components had to be developed with the .NET Framework 4.71, while the client-side code should be usable under both 4.71 and .Net Core. Another separate task involved implementing a Splunk-based monitoring interface, which was used by a connector to the Gematik telematics infrastructure. The role exercised was that of a developer. The team size was 4 people.

    C# C++ .net core Unit-Tests WCF REST SOAP Wiremock Microsoft Visual Studio xUnit

Recommendations

Be the first to recommend Harald

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • Diploma Physicist
    RWTH Aachen
    1986

Skill set

Categories