About

I am an independent IT consultant and freelance software developer specialized in IBM Mainframe Systems (z/OS) and Microsoft .NET framework. I work on a contract basis anywhere in the European Union where the working language is English, German or Dutch.
My motto is "have laptop, will travel".

I am a pioneer in computer software. I wrote my first program in 1968 at a time when computers had no display screens and no hard disks. In those days, punch cards and magnetic tapes were the only media for storing data as well as for the programs themselves. Those were the days when IBM dominated the computer market.
From 1968 to 2005, I was a System/Software programmer and administrator on IBM Mainframe computers. I wrote primarily highly specialized software in Assembler language.

Meanwhile, I have more than 50 years experience in writing and designing computer software.

Since 2005, I specialized on the Microsoft .NET platform developing front-end and back-end systems, programming in C#.
More recently, since 2024, I turned to Artificial Intelligence and I am meanwhile an expert in writing front-end appications that are based on the API of OpenAI such as Realtime, Images, Responses, Files and Audio. In addition, I have also experience in developing MCP client/server applications (Model Context Protocol).

 

Contact

If you wish to contact me, send an email to:  <william@van-den-heuvel.com