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Roy van Rijn

@royvanrijn.com

1.2K followers 170 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 · 3d

Drinks with @openvalue.eu at #Devoxx (as usual)...

See you there?

Roy van Rijn @royvanrijn.com · 5d

😒

Roy van Rijn @royvanrijn.com · 6d

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”

Roy van Rijn @royvanrijn.com · Sep 8

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!

Roy van Rijn @royvanrijn.com · Sep 8

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

a man in a tuxedo is holding a cup of tea

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

media.tenor.com

Roy van Rijn @royvanrijn.com · Sep 8

Oh, found it.

bsky.app/profile/paul...

Boe.

Bring back Łink @pauline-vos.nl · Sep 8

Het ging over een man die om 10 uur 's ochtends z'n volledige sealtje sos over straat liet vallen en het vervolgens direct van de grond op probeerde op te snuiven met een stukje papier.

Bring back Łink @pauline-vos.nl · Sep 5

Wil iemand wedje leggen waar de voice note over gaat voordat ik em luister?

Roy van Rijn @royvanrijn.com · Sep 8

Projectielbraken?

Roy van Rijn @royvanrijn.com · Sep 8

☕️ Caffeine is inevitable.

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

Roy van Rijn @royvanrijn.com · Sep 5

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

youtu.be/n-YK3B4_xPA?...

Solving Java’s 1 Billion Row Challenge (Ep. 1) | With @caseymuratori

YouTube video by Marco Codes

Reposted by Roy van Rijn

YOW! Conferences @yowconf.bsky.social · Aug 25

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

Roy van Rijn @royvanrijn.com · Aug 12

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?

Roy van Rijn @royvanrijn.com · Aug 12

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 👌🏼

Roy van Rijn @royvanrijn.com · Aug 12

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.

Roy van Rijn @royvanrijn.com · Aug 12

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

Roy van Rijn @royvanrijn.com · Aug 12

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.

Roy van Rijn @royvanrijn.com · Aug 12

Roy, it looks like there is a typo in your resume, it says Scumm Master instead of Scrum Master.

...

Nope.

Roy van Rijn @royvanrijn.com · Aug 12

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 💪

Roy van Rijn @royvanrijn.com · Aug 12

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.

Reposted by Roy van Rijn

YOW! Conferences @yowconf.bsky.social · Jul 30

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

Roy van Rijn @royvanrijn.com · Jul 2

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

Roy van Rijn @royvanrijn.com · Jun 25

🙏 Want to help? Read and share Rob's story and consider donating. Even €10 makes a tangible difference and can save lives.

www.100procentmalawi.org/donations

These are Benjamin and Bright orphaned this month (June 2025) Father had already died of aids and now the mother too. The twins also infected with HIV. Still too small to walk, they are taken in by g...

www.100procentmalawi.org

Roy van Rijn @royvanrijn.com · Jun 25

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

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

Roy van Rijn @royvanrijn.com · Jun 19

He made Windows (tm)?

Roy van Rijn @royvanrijn.com · Jun 18

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.

Roy van Rijn @royvanrijn.com · Jun 5

en.wikipedia.org/wiki/Monte_C...

Monte Carlo tree search - Wikipedia

en.wikipedia.org