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Roy van Rijn

@royvanrijn.com

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

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01.09.2023
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Latest posts by Roy van Rijn @royvanrijn.com

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@dashorst.bsky.social Found wicket "in the wild"... not working though haha.

Hey @ns.nl, your portal is broken...

03.02.2026 12:16 πŸ‘ 0 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

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

14.12.2025 10:29 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Thanks for being such an amazing host!

04.12.2025 03:16 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Where? 🀣

04.12.2025 01:41 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

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

04.12.2025 01:41 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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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.

04.12.2025 00:21 πŸ‘ 5 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

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.

05.11.2025 08:50 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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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

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

05.11.2025 08:09 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

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

05.11.2025 08:05 πŸ‘ 4 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

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

30.10.2025 19:11 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

The em-dash is a clear indicator text was generated by AI.

What is the em-dash of generated code?

30.10.2025 18:54 πŸ‘ 0 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0
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Periodic reminder…

30.10.2025 12:14 πŸ‘ 12 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0

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

29.10.2025 20:39 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Damn, just looked up Apeldoorn, that area is amazing

29.10.2025 14:56 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

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

29.10.2025 07:13 πŸ‘ 5 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0
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Next up we’re learning how to use Agentic AI/MCP using Kotlin with David Stibbe

28.10.2025 19:01 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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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 πŸ’ͺ🏼

28.10.2025 17:34 πŸ‘ 3 πŸ” 1 πŸ’¬ 0 πŸ“Œ 1
Preview
πŸ“’ Writing Fearless Tests & Agentic AI in Kotlin, Tue, Oct 28, 2025, 5:30 PM | Meetup **RotterdamJUG** is back with **two** amazing talks: **Wouter Bauweraerts** πŸ‡§πŸ‡ͺ will share how to write tests that truly survive refactoring, while **David Stibbe** πŸ‡³πŸ‡±

There are still some spots available for the next @rotterdamjug.bsky.social meetup:

www.meetup.com/rotterdamjug...

RSVP now!

21.10.2025 14:03 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Drinks with @openvalue.eu at #Devoxx (as usual)...

See you there?

06.10.2025 14:07 πŸ‘ 12 πŸ” 3 πŸ’¬ 2 πŸ“Œ 0

πŸ˜’

04.10.2025 07:47 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

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? πŸ˜‚

β€œThis talk is made possible by Squarespace/NordVPN/Raid Shadow Legends/Brilliant”

03.10.2025 07:29 πŸ‘ 17 πŸ” 0 πŸ’¬ 4 πŸ“Œ 0

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... πŸ‘» πŸŽƒ

If you're interested, DM me!

08.09.2025 08:15 πŸ‘ 9 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
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a man in a tuxedo is holding a cup of tea ALT: a man in a tuxedo is holding a cup of tea

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

08.09.2025 08:07 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Oh, found it.

bsky.app/profile/paul...

Boe.

08.09.2025 07:43 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Projectielbraken?

08.09.2025 07:41 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

β˜•οΈ Caffeine is inevitable.

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

08.09.2025 07:41 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Solving Java’s 1 Billion Row Challenge (Ep. 1) | With @caseymuratori
Solving Java’s 1 Billion Row Challenge (Ep. 1) | With @caseymuratori YouTube video by Marco Codes

Seen this series (in progress) @gunnarmorling.dev ?

youtu.be/n-YK3B4_xPA?...

05.09.2025 11:47 πŸ‘ 16 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0
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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

25.08.2025 01:49 πŸ‘ 8 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

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?

12.08.2025 12:40 πŸ‘ 2 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

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 πŸ‘ŒπŸΌ

12.08.2025 12:30 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0