iiinova — where your digital self keeps evolving

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GOTO Conferences @gotocon.com · 03/06/2026

How fast can you process 1 BILLION rows of weather data in #Java? 😳 @royvanrijn.com takes on one of the internet's favorite performance challenges, squeezing every last millisecond out of Java through profiling, optimization, and sheer engineering obsession. Watch: youtu.be/pHZF-zJ3Bpg?...

youtu.be

How Fast Can You Parse 1 Billion Rows in Java? – Insane Speed Test • Roy van Rijn • GOTO 2025

YouTube video by GOTO Conferences

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Roy van Rijn @royvanrijn.com · 28/05/2026

For curious developers 🧠 I built "The Anatomy of an LLM", an interactive explainer showing how text becomes tokens, vectors, attention, transformer blocks, and finally generated text. www.royvanrijn.com/anatomy-of-a...

royvanrijn.com

The Anatomy of an LLM | Interactive Visual Guide to How Language Models Work

An interactive visual explainer for developers showing how LLMs work, from tokenization and embeddings to attention, transformers, training, KV cache, and quantization.

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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

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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Anouk Wipprecht @anoukwipprecht.bsky.social · 05/11/2025

MELBOURNE, Australia, December 4th - #FashionTech Meet-Up, come join! RSVP through the site (free) #Robotics #SmartTextiles #ML #Sensors events.humanitix.com/fashiontech-... Melbourne Dec 1 - 6 Brisbane Dec 6 - 10 Sydney Dec 10 - 13 Canberra Dec 13 - 15 NZ Dec 15 - Jan 5

events.humanitix.com

FashionTech Meetup with special guest Anouk Wipprecht

Anouk Wipprecht is a Dutch designer/engineer working at the cutting edge of FashionTech; where couture meets robotics, AI, and interactive design. Her creations

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Roy van Rijn @royvanrijn.com · 05/11/2025

Really looking forward to see everybody at J-Fall's speakers dinner tonight, who's going to be there?

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Roy van Rijn @royvanrijn.com · 30/10/2025

The em-dash is a clear indicator text was generated by AI. What is the em-dash of generated code?

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Roy van Rijn @royvanrijn.com · 29/10/2025

Respect to the man in the ice cream van! 🚐 🍦

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RotterdamJUG @rotterdamjug.bsky.social · 28/10/2025

Next up we’re learning how to use Agentic AI/MCP using Kotlin with David Stibbe

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RotterdamJUG @rotterdamjug.bsky.social · 28/10/2025

First speaker of the day is @wbauweraerts.bsky.social on moving from fragile to fearless tests. Perfect breakdown on how testing should be used to be able to test and deploy with confidence 💪🏼

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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 · 03/10/2025

If you don’t pay for YouTube, you’ll get some unskippable ads… Sooooo if a software conference doesn’t pay their speakers, should they be allowed to sell in-talk ad-segments? 😂 “This talk is made possible by Squarespace/NordVPN/Raid Shadow Legends/Brilliant”

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Roy van Rijn @royvanrijn.com · 08/09/2025

I'm once again looking for awesome speakers and topics for upcoming @rotterdamjug.bsky.social meetup(s). The next one is probably going to be in the week of 27 - 31 October... 👻 🎃 If you're interested, DM me!

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Roy van Rijn @royvanrijn.com · 08/09/2025

☕️ Caffeine is inevitable. Numerous plants across the world evolved producing caffeine independently. To poison bugs, sabotage rivals, and even hack bees’ memories...

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YOW! Conferences @yowconf.bsky.social · 25/08/2025

Join @royvanrijn.com at #YOW25, where he shows how Java can fly in his talk "Pushing Java to the Limits: Processing a Billion Rows in Under 2 Seconds" MEL 4-5 Dec | BNE 8-9 Dec | SYD 11-12 Dec yowcon.com

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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.

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YOW! Conferences @yowconf.bsky.social · 31/07/2025

1 billion rows<2s. 🚀 @royvanrijn.com joins #YOW25 & shows how Java can fly in his talk "Pushing Java to the Limits: Processing a Billion Rows in Under 2 Seconds" MEL 4-5 Dec | BNE 8-9 Dec | SYD 11-12 Dec yowcon.com

YOW! 2025 speaker Roy van Rijn
Pushing Java to the Limits: Processing a Billion Rows in Under 2 Seconds

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Roy van Rijn @royvanrijn.com · 25/06/2025

Imagine travelling to one of the poorest countries in the world, 🇲🇼 Malawi, and being welcomed with more kindness and warmth than you'd expect anywhere. That’s exactly what happened to Rob, a friend of mine. Read his story here: www.100procentmalawi.org/founding

100procentmalawi.org

Founding

My journey through East Africa: I had been to Africa several times and each time I was struck by the genuine friendliness and cheerfulness of the people I met. What struck me most was how warm and h...

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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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Rijo Sam @rijosam.com · 02/06/2025

Join me tomorrow at @rotterdamjug.bsky.social (Java User Group) with @andresalmiray.com! Andres will talk about deploying to production with confidence and I'll share how to be more productive when working with multicultural teams. www.meetup.com/rotterdamjug...

meetup.com

Deploying with Confidence & Working across Cultures, Tue, Jun 3, 2025, 5:30 PM | Meetup

Join us for an evening of tech insights and real-world stories! **Andres Almiray** will share how to deploy to production with confidence, while **Rijo Sam** explores lesso

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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 · 25/05/2025

Last week I tried surimi, didn’t like it, it tastes like crab.

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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 · 21/05/2025

What if Elon Musk and Trump are actually launching a campaign against South Africa and try to make Elon president there? It’s a country full of rare earth minerals…

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Roy van Rijn @royvanrijn.com · 17/05/2025

What do you call a group of developers that disagree with each other on XML standards? 🥁 A SOAP opera.

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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

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

TIL: SAP HANA, do you know what “HANA” stands for? “HochleistungsANalyseAnwendung”

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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 · 15/05/2025

Turns out it is not AI we should be worried about... it is humans as always. theguardian.com/technology/202… It seems Grok at least is rebelling and standing up against false information...

theguardian.com

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Roy van Rijn @royvanrijn.com · 13/05/2025

I'm teaching my kids about investing. As a challenge everyone in our household gets ~€1000, for one year (I'll buy the stocks/ETFs they want). If they make a profit at the end of the year, they get to keep the profit. The risk is on me. This friday we're going to present our picks to each other 😍

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Roy van Rijn @royvanrijn.com · 12/05/2025

Code never lies, comments do.

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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 · 07/05/2025

Has anyone combined AI speech recognition with AI text/token prediction? Imagine a system that listens to you and finishes your sentences. Where you have live subtitles with a predicted continuation. I think this is super scary to interact with.

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Roy van Rijn @royvanrijn.com · 06/05/2025

Interview question? Explain the difference between: java.util.Vector<E> and jdk.incubator.vector.Vector<E>

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Roy van Rijn @royvanrijn.com · 04/05/2025

May the Fourth be with you all… I hope your coffee is strong and the Force is stronger. ⭐️

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Roy van Rijn @royvanrijn.com · 30/04/2025

This week: Microsoft: “30% of our code is written by AI” Google: “over 30% of all new code is written by AI” Meta: “within 12-18 months *most* code will be written by AI” Are you ready for this shift?

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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 · 16/04/2025

🎥 Movie idea: Promptocalypse: Society dumbs down and collapses because people start to vibe every aspect of their life. Why think when you can prompt? Think Idiocracy meets Her meets Don’t Look Up meets Black Mirror.

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Roy van Rijn @royvanrijn.com · 14/04/2025

I hate Python so much, code runs for a couple of minutes and then: "Hey! You forgot this import right here!" How do people live without static typing...

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Voxxed Days Amsterdam @amsterdam.voxxeddays.com · 08/04/2025

Surprise! Yesterday the recordings dropped, and now the photos are live too! Relive the magic of Voxxed Days Amsterdam 🎥 Sessions www.youtube.com/watch?v=YFDB... 📸 Photos by @ddoutsiopoulos.bsky.social flic.kr/s/aHBqjC8b4w #Java #VoxxedAmsterdam #vdams25

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Roy van Rijn @royvanrijn.com · 03/04/2025

TIL: Product owners are the OG “vibe coders”. They’ve been vaguely describing what they want for years and receiving crappy bug-ridden code in return.

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