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Simon de Haan

@sdehaan

Turn.io Co-Founder & CTO.

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18.11.2023
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Latest posts by Simon de Haan @sdehaan

Didn’t think I’d ever say this but, be a Batman in your field.

23.11.2025 20:13 👍 0 🔁 0 💬 1 📌 0

It was not! blog.cloudflare.com/18-november-... Impressed by their ability to get a detailed post mortem out so fast.

19.11.2025 05:40 👍 0 🔁 0 💬 0 📌 0

I bet it’s gonna be DNS again. #cloudflare

18.11.2025 12:14 👍 3 🔁 0 💬 0 📌 1

Moved to Elixir 1.19 in production. Total non-event. #elixirlang

12.11.2025 12:02 👍 16 🔁 2 💬 2 📌 0

Hit off-by-1 errors in timing related tests when upgrading to Elixir 1.19. Turns out DateTime.diff changed subtly, it used to drop microseconds (everything rounded to seconds), now keeps them. Our tests relied on old behavior without realizing it. Hopefully saves ppl some debug time! 😅 #ElixirLang

30.10.2025 10:19 👍 7 🔁 1 💬 1 📌 0

Things that are unreasonably hard when running systems at scale: counting stuff accurately

28.10.2025 13:35 👍 0 🔁 0 💬 0 📌 0

Love this.

07.10.2025 17:05 👍 1 🔁 0 💬 1 📌 0
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I would like to see a new benchmark on how well different LLMs are able to diagnose issues raised by Dialyzer. #myelixirstatus #elixir

12.08.2025 15:02 👍 1 🔁 0 💬 0 📌 0
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Malleable software: Restoring user agency in a world of locked-down apps The original promise of personal computing was a new kind of clay. Instead, we got appliances: built far away, sealed, unchangeable. In this essay, we envision malleable software: tools that users can...

www.inkandswitch.com/essay/mallea... 🫶🏻

10.06.2025 14:26 👍 0 🔁 0 💬 0 📌 0
Artikel in dagblad trouw: “De mensen om wie het ging verdwenen onder Faber uit het zicht”, de titel.

Artikel in dagblad trouw: “De mensen om wie het ging verdwenen onder Faber uit het zicht”, de titel.

Artikel in dagblad trouw: “De mensen om wie het ging verdwenen onder Faber uit het zicht”, deel 1.

Artikel in dagblad trouw: “De mensen om wie het ging verdwenen onder Faber uit het zicht”, deel 1.

Artikel in dagblad trouw: “De mensen om wie het ging verdwenen onder Faber uit het zicht”, deel 2.

Artikel in dagblad trouw: “De mensen om wie het ging verdwenen onder Faber uit het zicht”, deel 2.

Wat heeft Faber nou eigenlijk bereikt? Dagblad @trouw.nl: Enkel dat de bestempeling van kwetsbare mensen tot zondebokken voor alles, hun reducering tot cijfers en “gelukszoekers” en het illegale afpakken van mensenrechten nu als normaal beleid beschouwd worden. En niet meer als moreel schandaal.

04.06.2025 07:43 👍 16 🔁 9 💬 1 📌 0

This is incredible!

04.06.2025 05:13 👍 1 🔁 0 💬 1 📌 0
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Schrijnende constatering.

03.06.2025 10:43 👍 47 🔁 13 💬 2 📌 1
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🧠 Both AI optimists and pessimists are missing the point. The real conversation should be about how we build trustworthy systems—not about sentience or superintelligence. Let's focus on practical risks and benefits instead of sci-fi scenarios.

🔗 ➡️ fly.io/blog/youre-a...

03.06.2025 03:23 👍 5 🔁 1 💬 0 📌 0
There is one place, however, where Musk, with the help of his minions, achieved his goals. He did indeed shred U.S.A.I.D. Though a rump operation is now operating inside the State Department, the administration says that it has terminated more than 80 percent of U.S.A.I.D. grants. Brooke Nichols, an associate professor of global health at Boston University, has estimated that these cuts have already resulted in about 300,000 deaths, most of them of children, and will most likely lead to significantly more by the end of the year. That is what Musk’s foray into politics accomplished.

There is one place, however, where Musk, with the help of his minions, achieved his goals. He did indeed shred U.S.A.I.D. Though a rump operation is now operating inside the State Department, the administration says that it has terminated more than 80 percent of U.S.A.I.D. grants. Brooke Nichols, an associate professor of global health at Boston University, has estimated that these cuts have already resulted in about 300,000 deaths, most of them of children, and will most likely lead to significantly more by the end of the year. That is what Musk’s foray into politics accomplished.

Musk should be asked about this in every interview he does now and forever. To ignore it is a dereliction of duty.

www.nytimes.com/2025/05/30/o...

30.05.2025 16:20 👍 39806 🔁 13844 💬 1265 📌 820
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tfw design is your passion and there's a job opening @ turn.io for a senior product designer www.turn.io/careers/seni...

26.05.2025 11:15 👍 1 🔁 1 💬 0 📌 0

i think it should be a bigger story that the president held a meeting with a foreign head of state where he ranted about the most gutter white supremacist propaganda you can find on the internet

22.05.2025 00:17 👍 27539 🔁 6313 💬 387 📌 267

Have you come across the “I got a dog so I could talk to other strangers with a dog” folks yet?

21.05.2025 09:03 👍 1 🔁 0 💬 1 📌 0
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Chat for impact | Turn.io An impactful conversation at a key moment can change a life. Turn.io is a chat platform to build services that improve millions of lives.

Yesterday’s 20 hour turn.io unintentional load test was compliments of a customers infinite http request loop!

21.05.2025 09:01 👍 0 🔁 0 💬 0 📌 0

Amazing! Go David!

15.05.2025 09:39 👍 1 🔁 0 💬 0 📌 0
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Omtzigt bij afscheid: politiek onvoldoende bezig met echte problemen Het "giftige politieke klimaat" is de scheidend NSC-leider ook steeds meer gaan tegenstaan.

nos.nl/l/2567077 man met auto in de file klaagt over het file probleem.

13.05.2025 16:50 👍 3 🔁 0 💬 0 📌 0

This is incredible. Even the work required to deploy that much money is mind boggling www.gatesnotes.com/n20-years-to...

08.05.2025 19:14 👍 1 🔁 0 💬 0 📌 0

Thanks for coming to my TED talk.

08.05.2025 19:12 👍 1 🔁 0 💬 0 📌 0

And teams that do build around microservices seem way more likely to start hating each other and throwing things over the fence as a result of the API contracts.

08.05.2025 19:12 👍 1 🔁 0 💬 1 📌 0

For the most part to me it seems like microservices make more sense when you have teams that hate each other and only want to communicate via API contracts.

08.05.2025 19:10 👍 1 🔁 0 💬 1 📌 0
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Chat for impact | Turn.io An impactful conversation at a key moment can change a life. Turn.io is a chat platform to build services that improve millions of lives.

It’s entertaining to me that our Turn.io app is the most network distributed application I’ve ever been part of building while also the largest monolith. Thanks to #elixirlang microservices aren’t a tax worth paying or even make sense to consider from an architecture standpoint.

08.05.2025 19:09 👍 10 🔁 0 💬 3 📌 0

🎯

10.04.2025 16:33 👍 0 🔁 0 💬 0 📌 0

Seeing these types of comments by @josevalim.bsky.social on Github discussions spark joy and joy is contagious. #myelixirstatus

10.04.2025 10:22 👍 8 🔁 0 💬 0 📌 0
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Current Slack status:

10.04.2025 10:20 👍 7 🔁 1 💬 0 📌 1