iiinova — where your digital self keeps evolving

Reposted by Roy van Rijn

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 · 14/12/2025

Wait, Thomas won the contest 🤔 he did hire one of the developers that participated and made an amazing piece of code.

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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

Oh wait haha, I’m in Australia right now.

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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 · 05/11/2025

Surely there is a toggle for that... somewhere? I have the same with YouTube on my TV, always re-enabling English subtitles for Dutch videos, which... I don't want or need.

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Reposted by Roy van Rijn

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

sum = a + b; // Add a and b to get the sum

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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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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 · 29/10/2025

Damn, you need a map to get to a polling station?

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Reposted by Roy van Rijn

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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Reposted by Roy van Rijn

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

It's just the right amount of poison for humans, makes us awake and alert, is slightly addictive (but not too much), it's perfect. /me runs downstairs for another doppio for the next meeting

media.tenor.com

a man in a tuxedo is holding a cup of tea

ALT: a man in a tuxedo is holding a cup of tea

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

Oh, found it. bsky.app/profile/paul... Boe.

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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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Reposted by Roy van Rijn

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

The only fear I have is AI taking away junior positions… creating a gap that new developers can’t easily bridge. We’ll only want medior/senior developers that create great code and the bots will write it all. But how do we make sure there will be senior educated and experienced devs in the future?

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Roy van Rijn @royvanrijn.com · 12/08/2025

I’ve survived: Dependency injection wars Frontend framework wars C++/Java is dying People are only copying from Stack Overflow-era Everything must be Scrum-era (And many more) We’ll be okay 👌🏼

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Roy van Rijn @royvanrijn.com · 12/08/2025

That’s just the always present existential dread of life 😅 I’ve been a professional dev for over 20 years, and I’ve always seen people (and felt that way myself) talk about how things will derail.

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Roy van Rijn @royvanrijn.com · 12/08/2025

Exactly, sometimes you put one hand in, you put one hand out... you put one hand in, and you shake it all about.

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Roy van Rijn @royvanrijn.com · 12/08/2025

Consequences arrive sooner. Mediocre developers are exposed. Good engineers will only get more valuable. All of these are positives, it'll hopefully drive developers away from trivial "typing of code", towards making well designed maintainable systems.

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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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Roy van Rijn @royvanrijn.com · 12/08/2025

My hope is that developers across the board will now have additional brainpower to spend to hone their analytical and problem solving skills! Let's keep it optimistic 💪

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Roy van Rijn @royvanrijn.com · 12/08/2025

It won't be about replacing, it's all about giving developers more/powerful tools. It'll probably mostly benefit developers that have a great sense of overview, problem solving and analytical skills. .. those developers are already "the best ones" IMHO... so I don't even see a shift happening.

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Reposted by Roy van Rijn

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 · 02/07/2025

Synchronized Presenting could be one of Java's Olympic events 🥇🥈🥉

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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 · 18/06/2025

Wage growth isn't necessarily a sign it's "going well", it's a sign of inflation, meaning what you already own will be worth less and less.

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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 · 04/06/2025

At the hogeschool? I still need to drop something off there this week… 🤔

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