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Roy van Rijn

@royvanrijn.com
1.3K followers 169 following 2.2K posts

Director of OpenValue Rotterdam, is a @Java_Champions, founder of Rotterdam JUG, public speaking: Java, AI, math, algorithms

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Roy van Rijn @royvanrijn.com · 03/02/2026
@dashorst.bsky.social Found wicket "in the wild"... not working though haha. Hey @ns.nl, your portal is broken...
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Roy van Rijn @royvanrijn.com · 04/12/2025
Thanks for being such an amazing host!
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Roy van Rijn @royvanrijn.com · 04/12/2025
Going to New Zealand in two weeks... and I'm still not convinced platypuses are real, I'm pretty sure it's just beavers-with-strap-on-beaks.
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Roy van Rijn @royvanrijn.com · 30/10/2025
Periodic reminder…
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Roy van Rijn @royvanrijn.com · 29/10/2025
Damn, just looked up Apeldoorn, that area is amazing
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Roy van Rijn @royvanrijn.com · 06/10/2025
Drinks with @openvalue.eu at #Devoxx (as usual)... See you there?
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Roy van Rijn @royvanrijn.com · 12/08/2025
Roy, it looks like there is a typo in your resume, it says Scumm Master instead of Scrum Master. ... Nope.
ScummVM logo
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Roy van Rijn @royvanrijn.com · 19/06/2025
He made Windows (tm)?
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Roy van Rijn @royvanrijn.com · 05/06/2025
Found one, this algorithm is easy.
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Roy van Rijn @royvanrijn.com · 04/06/2025
Best slogan I could come up with for a software company from Rotterdam 😅 Get your @openvalue.eu Rotterdam laptop sticker at @joyofcoding.bsky.social later this month 👍🏼
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Roy van Rijn @royvanrijn.com · 26/05/2025
Israel has its Iron Dome. America will get a Golden Dome. I propose a similar project for the Netherlands, we can call it… the Thunder Dome.
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Roy van Rijn @royvanrijn.com · 22/05/2025
This is by far the best and scariest AI-generated creation I’ve come across. (made with Veo 3)
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Roy van Rijn @royvanrijn.com · 22/05/2025
A shift is happening in our family's € 1000,- investment challenge... I've started to make a comeback, almost back into the green, my partner finally started to drop a little, and kid 1 is in a free fall 😅 📉
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Roy van Rijn @royvanrijn.com · 16/05/2025
Wanted to take a shower but I suddenly have this incredible urge to complain and mumble “everything used to be better”… odd.
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Roy van Rijn @royvanrijn.com · 16/05/2025
“It’s a mé”
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Roy van Rijn @royvanrijn.com · 16/05/2025
Same, m'n kinderen hebben deze nog niet ontdekt, maar nu is er een mooie aanleiding.
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Roy van Rijn @royvanrijn.com · 16/05/2025
Fastest way to check if a year is a leap year? hueffner.de/falk/blog/a-... Best part: "I couldn't immediately find a way to prove it, so I employed the tried-and-true method of getting someone else to do it for me by posting it to the Code Golf StackExchange."
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Roy van Rijn @royvanrijn.com · 15/05/2025
Found a jumping spider (Marpissa muscosa) with a cool beard.
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Roy van Rijn @royvanrijn.com · 13/05/2025
Me too! Right now it doesn't seem to be me haha. But hey, it's a long game, both kid 2 and myself expect a recession and not a bull market (like today).
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Roy van Rijn @royvanrijn.com · 11/05/2025
I’m getting a crash course on the lore of Italian brainrot. And I’m 100% convinced teenagers these days would love Salvador Dali.
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Roy van Rijn @royvanrijn.com · 19/04/2025
I mean, why *not* put yourself into Thunderbirds...
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Roy van Rijn @royvanrijn.com · 01/04/2025
It was awesome trying out the alpha version of NeuroCoder™. Here you can see me learning Vue.js after hearing about it in the closing keynote.
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Roy van Rijn @royvanrijn.com · 31/03/2025
At least until I end up with a team where the majority is gen-z. Then I’ll probably need to start recording TikTok PR’s…. 🫤
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Roy van Rijn @royvanrijn.com · 30/03/2025
TIL: The first nearly complete Neanderthal skeleton found in 1908 had severe arthritis, especially in his spine. Paleontologists assumed Neanderthals were dumb hunched-over apelike caveman… Wasn’t until 40+ years later they realized Neanderthals were fully bipedal, walking exactly like we do today.
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Roy van Rijn @royvanrijn.com · 13/03/2025
You: I’m a Scrum Master Me: I’m a SCUMM master…
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Roy van Rijn @royvanrijn.com · 08/03/2025
Meet the Harvard Computers an extraordinary group of women working at the Harvard College Observatory. They enabled measuring our place in the universe by measuring Cepheid stars. They discovered white dwarfs and demonstrated stars are mostly made of hydrogen and helium.
The Harvard Computers posing in front of a building
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Roy van Rijn @royvanrijn.com · 03/03/2025
Rest in peace Dieuwertje... 🫡
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Roy van Rijn @royvanrijn.com · 02/03/2025
This feels *really* unethical… What are your thoughts on Windsurf IDE’s experimental “motivational” prompt?
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Roy van Rijn @royvanrijn.com · 01/03/2025
Love this! youtu.be/a0CVCcb0RJM?...
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Roy van Rijn @royvanrijn.com · 28/02/2025
You know what’s peaceful? Jupiter at the moment, so I rolled out my telescope 🔭 🔴 (almost) LIVE
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Roy van Rijn @royvanrijn.com · 28/02/2025
Beach volleyball is a weird sport; you can dive onto soft sand a gazillion times without a scratch, and then suddenly the sand decides: “Yeah, that’s enough, give me all of your skin”.
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Roy van Rijn @royvanrijn.com · 27/02/2025
Lifestyle deflation 👌🏼😬
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Roy van Rijn @royvanrijn.com · 24/02/2025
Perhaps Grok 3 has reached AGI; it’s able to recognize BS better than a majority of US voters. I would have loved to see Elon’s face when they realized Grok was “woke”, and they had to botch this prompt-hack to censor it.
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Roy van Rijn @royvanrijn.com · 22/02/2025
Thanks 🙏🏻
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Roy van Rijn @royvanrijn.com · 21/02/2025
Red and a little bit of white… right?
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Roy van Rijn @royvanrijn.com · 21/02/2025
Not a coincidence, not acceptable.
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Roy van Rijn @royvanrijn.com · 17/02/2025
The French use it as well? Looked really German/Austrian to me haha, look at the coat of Tyrol:
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Roy van Rijn @royvanrijn.com · 14/02/2025
They demonstrate it's possible to construct an open-addressed hash table with improved expected search complexities, both amortized and worst-case, without the need to reorder elements over time. My (crude) Java implementation does show some encouraging results: github.com/royvanrijn/o...
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Roy van Rijn @royvanrijn.com · 28/01/2025
It's happening haha, self-improvement, kinda.
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Roy van Rijn @royvanrijn.com · 23/01/2025
As a kid, my parents were watching TV and on the news they reported that some group started using “guerrilla warfare” In school I was taught about Hannibal with his elephants, but using gorillas? That’s mental. My 10yo brain created scenes straight from the Planet of the Apes 🦍
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Roy van Rijn @royvanrijn.com · 21/01/2025
Trump signs executive orders proclaiming there are only two types of developers, frontend and backend. His comments: Enough with fake “full stack” and wasteful DevSecOps. Developers should know the world is binary, this or that, not both.
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Roy van Rijn @royvanrijn.com · 20/01/2025
But doing it twice definitely isn’t.
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Roy van Rijn @royvanrijn.com · 20/01/2025
Once is a coincidence…
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Roy van Rijn @royvanrijn.com · 14/01/2025
Using Kokoro-82M parameter open source TTS model to explain everything, makes me really zen haha github.com/remsky/Kokor...
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Roy van Rijn @royvanrijn.com · 14/01/2025
"mvn clean"
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Roy van Rijn @royvanrijn.com · 21/12/2024
I’ve seen quite a lot of Christmas cards that are wishing me a happy 2024… and I think I know why…
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Roy van Rijn @royvanrijn.com · 20/12/2024
It feels like you might be slightly biased... 😉@vik.thegresqlpost.org
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Roy van Rijn @royvanrijn.com · 18/12/2024
Is this a thing? Software where you talk to historical figures and are guided with objectives to learn about physics, math, history... This is the future of schooling... at your own pace, asking curious questions all the time. Learning French? 🇫🇷 Visit the boulangerie and order fresh croissants.
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Roy van Rijn @royvanrijn.com · 17/12/2024
1) Gut this device and shoe horn in a simple USB stick 2) Leave this device in any office 3) A *LOT* of people will insert your USB stick and even install the application you've left on there...
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Roy van Rijn @royvanrijn.com · 16/12/2024
'mvn christmas:tree'
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