Roy van Rijn
@royvanrijn.com
Director of OpenValue Rotterdam, is a @Java_Champions, founder of Rotterdam JUG, public speaking: Java, AI, math, algorithms
Reposted by Roy van Rijn
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-...
Melbourne Dec 1 - 6
Brisbane Dec 6 - 10
Sydney Dec 10 - 13
Canberra Dec 13 - 15
NZ Dec 15 - Jan 5
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
events.humanitix.com
November 5, 2025 at 8:09 AM
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-...
Melbourne Dec 1 - 6
Brisbane Dec 6 - 10
Sydney Dec 10 - 13
Canberra Dec 13 - 15
NZ Dec 15 - Jan 5
Really looking forward to see everybody at J-Fall's speakers dinner tonight, who's going to be there?
November 5, 2025 at 8:05 AM
Really looking forward to see everybody at J-Fall's speakers dinner tonight, who's going to be there?
The em-dash is a clear indicator text was generated by AI.
What is the em-dash of generated code?
What is the em-dash of generated code?
October 30, 2025 at 6:54 PM
The em-dash is a clear indicator text was generated by AI.
What is the em-dash of generated code?
What is the em-dash of generated code?
Respect to the man in the ice cream van! 🚐 🍦
October 29, 2025 at 8:39 PM
Respect to the man in the ice cream van! 🚐 🍦
Reposted by Roy van Rijn
Next up we’re learning how to use Agentic AI/MCP using Kotlin with David Stibbe
October 28, 2025 at 7:01 PM
Next up we’re learning how to use Agentic AI/MCP using Kotlin with David Stibbe
Reposted by Roy van Rijn
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 💪🏼
Perfect breakdown on how testing should be used to be able to test and deploy with confidence 💪🏼
October 28, 2025 at 5:35 PM
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 💪🏼
Perfect breakdown on how testing should be used to be able to test and deploy with confidence 💪🏼
There are still some spots available for the next @rotterdamjug.bsky.social meetup:
www.meetup.com/rotterdamjug...
RSVP now!
www.meetup.com/rotterdamjug...
RSVP now!
📢 Writing Fearless Tests & Agentic AI in Kotlin, Tue, Oct 28, 2025, 5:30 PM | Meetup
**RotterdamJUG** is back with **two** amazing talks:
**Wouter Bauweraerts** 🇧🇪 will share how to write tests that truly survive refactoring, while **David Stibbe** 🇳🇱
www.meetup.com
October 21, 2025 at 2:03 PM
There are still some spots available for the next @rotterdamjug.bsky.social meetup:
www.meetup.com/rotterdamjug...
RSVP now!
www.meetup.com/rotterdamjug...
RSVP now!
October 6, 2025 at 2:07 PM
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”
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”
October 3, 2025 at 7:29 AM
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”
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”
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!
The next one is probably going to be in the week of 27 - 31 October... 👻 🎃
If you're interested, DM me!
September 8, 2025 at 8:15 AM
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!
The next one is probably going to be in the week of 27 - 31 October... 👻 🎃
If you're interested, DM me!
☕️ Caffeine is inevitable.
Numerous plants across the world evolved producing caffeine independently. To poison bugs, sabotage rivals, and even hack bees’ memories...
Numerous plants across the world evolved producing caffeine independently. To poison bugs, sabotage rivals, and even hack bees’ memories...
September 8, 2025 at 7:41 AM
☕️ Caffeine is inevitable.
Numerous plants across the world evolved producing caffeine independently. To poison bugs, sabotage rivals, and even hack bees’ memories...
Numerous plants across the world evolved producing caffeine independently. To poison bugs, sabotage rivals, and even hack bees’ memories...
Solving Java’s 1 Billion Row Challenge (Ep. 1) | With @caseymuratori
YouTube video by Marco Codes
youtu.be
September 5, 2025 at 11:47 AM
Reposted by Roy van Rijn
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
MEL 4-5 Dec | BNE 8-9 Dec | SYD 11-12 Dec yowcon.com
August 25, 2025 at 1:49 AM
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
MEL 4-5 Dec | BNE 8-9 Dec | SYD 11-12 Dec yowcon.com
Roy, it looks like there is a typo in your resume, it says Scumm Master instead of Scrum Master.
...
Nope.
...
Nope.
August 12, 2025 at 11:41 AM
Roy, it looks like there is a typo in your resume, it says Scumm Master instead of Scrum Master.
...
Nope.
...
Nope.
Reposted by Roy van Rijn
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
@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
July 30, 2025 at 11:44 PM
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
@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
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
That’s exactly what happened to Rob, a friend of mine.
Read his story here:
www.100procentmalawi.org/founding
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...
www.100procentmalawi.org
June 25, 2025 at 7:45 AM
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
That’s exactly what happened to Rob, a friend of mine.
Read his story here:
www.100procentmalawi.org/founding
Found one, this algorithm is easy.
June 5, 2025 at 8:27 PM
Found one, this algorithm is easy.
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 👍🏼
Get your @openvalue.eu Rotterdam laptop sticker at @joyofcoding.bsky.social later this month 👍🏼
June 4, 2025 at 9:24 AM
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 👍🏼
Get your @openvalue.eu Rotterdam laptop sticker at @joyofcoding.bsky.social later this month 👍🏼
Reposted by Roy van Rijn
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...
@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...
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
www.meetup.com
June 2, 2025 at 8:23 AM
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...
@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...
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.
America will get a Golden Dome.
I propose a similar project for the Netherlands, we can call it… the Thunder Dome.
May 26, 2025 at 5:41 PM
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.
America will get a Golden Dome.
I propose a similar project for the Netherlands, we can call it… the Thunder Dome.
Last week I tried surimi, didn’t like it, it tastes like crab.
May 25, 2025 at 6:09 PM
Last week I tried surimi, didn’t like it, it tastes like crab.
This is by far the best and scariest AI-generated creation I’ve come across.
(made with Veo 3)
(made with Veo 3)
May 22, 2025 at 10:23 PM
This is by far the best and scariest AI-generated creation I’ve come across.
(made with Veo 3)
(made with Veo 3)
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 😅 📉
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 😅 📉
May 22, 2025 at 12:59 PM
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 😅 📉
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 😅 📉