![Willem Laurentz Middelkoop](../global/images/Willem-Laurentz-Middelkoop-02.jpg)
Willem L. Middelkoop MSc BICT
IT business owner, investor, hacker and software developer
![Registered Apple Developer since 2008](../global/images/logo-Apple-Developer.png)
![Registered Android Developer since 2012](../global/images/logo-Android-Developer.png)
![Microsoft Certified Application Developer since 2005](../global/images/logo-Microsoft-Certified-Application-Developer.png)
![CompTIA Network+ Certified since 2004](../global/images/logo-CompTIA-Network-Plus-Certified.png)
![Swimming certificate A since 1991](../global/images/logo-zwemdiploma-a.jpg)
![](/global/images/logo-Lemmid-Store.png)
Lemmid Store
With Lemmid Store business owners can easily sell products online via their own website, independently from big (powerful) platforms.
![](/global/images/logo-DigiDef.png)
DigiDef
DigiDef is a specialised bureau that analyses existing computer systems and offers help with improving security.
![](/global/images/logo-Lemmid.png)
Lemmid B.V.
Lemmid provides internet services for selected Dutch and international customers. Together with the customer Lemmid develops new IT products and services, including websites, web applications and apps.
![](/global/images/logo-dsd-164.png)
dsd 164 B.V.
dsd 164 B.V. is a publisher of mobile apps for the international market. Apps from dsd 164 B.V. are downloaded millions of times.
![](/global/images/logo-Willem-Laurentz-Holding-BV.png)
Willem & Laurentz Holding B.V.
The Willem & Laurentz Holding B.V. invests in technology related companies. It is actively contributing to the development of new initiatives.
![](/global/images/icon-Snake-97.png)
Snake '97
Play Snake like it is 1997. This is a remake of the original Snake, complete with dot-matrix display and monotone sounds. The game has millions of fans world wide.
Half Marathon
On Training, Data and Feeling
![Discover my journey from noob to (half) marathon finisher and how I balanced data with fitness - read about my experiences!](/blog/2024-03-24_half-marathon/images/Half-Marathon.jpg)
Last Sunday, I participated in the Venloop, a half marathon event in Venlo. I completed the 21KM run in 2h05, a result I am satisfied with as this was my first ever 'official' event since I began running just three months ago. In this post, I'll share my experiences with training, balancing fitness data, and feeling fit.
No, I Won't Build That!
Better Thinking, Better Work
![Discover how saying 'no' can lead to more innovative and meaningful work in this blog post:](/blog/2024-03-05_no-i-won-t-build-that/images/No-I-Won-t-Build-That.jpg)
If you're an accomplished developer (as in: you've actually created things in the past), you may recognise this scenario: people reaching out to you, asking you to build something specific. "Can you build X for me?" A fellow technician once urged me to refuse more often: be proud of the things you don't do! Let me explain in this post.
Vision Pro
Exploring Spatial Computing
![My thoughts on using Vision Pro to get some real work done, exploring what Spatial Computing means and how it can be useful.](/blog/2024-02-16_vision-pro/images/Vision-Pro.jpg)
Currently, I am overlooking a lake at Mount Hood while writing this. I hear birds in the distance and see the lake calm, with subtle waves and some mist in the distance. Yet, it is fake, as I am sitting on our top floor, a barely furnished room full of items belonging to a family house with two young kids. I am using Apple's Vision Pro to explore what Spatial Computing can be. I am in awe; let me explain in this blog post.