Simon de Haan
sdehaan.bsky.social
Simon de Haan
@sdehaan.bsky.social
Turn.io Co-Founder & CTO.
Moved to Elixir 1.19 in production. Total non-event. #elixirlang
November 12, 2025 at 12:02 PM
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
October 30, 2025 at 10:19 AM
Things that are unreasonably hard when running systems at scale: counting stuff accurately
October 28, 2025 at 1:35 PM
I would like to see a new benchmark on how well different LLMs are able to diagnose issues raised by Dialyzer. #myelixirstatus #elixir
August 12, 2025 at 3:02 PM
Reposted by Simon de Haan
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.
June 4, 2025 at 7:43 AM
Reposted by Simon de Haan
Schrijnende constatering.
June 3, 2025 at 10:43 AM
Reposted by Simon de Haan
🧠 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...
June 3, 2025 at 3:23 AM
Reposted by Simon de Haan
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...
May 30, 2025 at 4:20 PM
tfw design is your passion and there's a job opening @ turn.io for a senior product designer www.turn.io/careers/seni...
May 26, 2025 at 11:16 AM
Reposted by Simon de Haan
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
May 22, 2025 at 12:17 AM
Yesterday’s 20 hour turn.io unintentional load test was compliments of a customers infinite http request loop!
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.
turn.io
May 21, 2025 at 9:01 AM
nos.nl/l/2567077 man met auto in de file klaagt over het file probleem.
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
May 13, 2025 at 4:50 PM
This is incredible. Even the work required to deploy that much money is mind boggling www.gatesnotes.com/n20-years-to...
www.gatesnotes.com
May 8, 2025 at 7:14 PM
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.
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.
Turn.io
May 8, 2025 at 7:09 PM
🎯
April 10, 2025 at 4:33 PM
Seeing these types of comments by @josevalim.bsky.social on Github discussions spark joy and joy is contagious. #myelixirstatus
Current Slack status:
April 10, 2025 at 10:22 AM
Current Slack status:
April 10, 2025 at 10:21 AM
Reposted by Simon de Haan
I can only imagine the bailout package they are drawing up for themselves.

As the saying goes, privatize the profits, and socialize the losses.
April 7, 2025 at 10:53 AM
Reminds of growing up in countries where having the picture of the president or other persons of authority visibly present at your place of business or work was a requirement. Performative signs of loyalty just to keep afloat. 🚩
4/4/25💪Murphy is the smartest male Democrat currently, speaking truth articulately ( #AOC overall) 🇺🇸
April 5, 2025 at 6:08 PM
Go Julia!!! 🙌 🙌
It’s incredible to hear how #ElixirLang impacts the world for good from Julia Mathias and Turn.io - using chats for mental health, WHO, refugees and more!
@alchemyconf.com
April 3, 2025 at 2:26 PM
One of my favourite errors in tests: 1st of the month off by 1 errors and daylight savings time off by 1 errors
April 2, 2025 at 8:52 AM
Reposted by Simon de Haan
Want a spoiler on Julia Mathias' talk? Here it is 👀

#AlchemyConf #MyElixirStatus #ElixirLang
March 17, 2025 at 11:29 AM