@wintermeyer
Account based inGermany
About this account
- Account based in
- Germany
- Connected via
- Germany App Store
Account-level information from X, not a live location or the device used for a specific post.
Phoenix/Elixir, Ruby on Rails, WebPerf, Asterisk/VoIP, AI u. Agentic Programming. Fediverse: @wintermeyer@vutuv.de
Germany
Joined May 2008
- Tweets21K
- Following177
- Followers2K
- Likes9.6K
Stefan Wintermeyer retweeted
Here are the slides for yesterday's #RailsWorld talk on applying the principles of harness engineering to raise the floor on the quality of generated Rails code
speakerdeck.com/joelq/harnes…
Stefan Wintermeyer retweeted
Tag writes >50% of my PRs every day. It also does ~100% of my data analysis, and fixes most of our product feedback + bugs.
It's not like a regular Slack bot. It is proactive, programmable, it has memory, it has access to your connectors. With Opus 5.5 and Fable 5.1, it has strong judgement.
Example prompts I use:
- "@Claude react to threads in this channel with ✅ when resolved"
- "@Claude from now on, attempt to repro every bug in this channel end to end, running the full app. once you reproduce the bug, put up a pr to fix it and tag the right team for code review"
- "@Claude brainstorm ~100 hypotheses for what could explain this weird data, use a workflow to in/validate. spend 10m tokens or so digging very deep. draw a chart with the result."
- "@Claude make me an interactive game explaining how this part of the code works, then make a slide deck explaining it for others on the team"
claude.com/product/tag
Claude Tag in Slack can now use your personal connectors!
You can now securely access that Drive doc, Salesforce account, or Warehouse table that you have personal access to right where the work happens.
Avail. on Teams today and Enterprise next week
claude.com/blog/claude-tag-n…
Computer use on Omarchy is going to be magic with Cua! 🤘
1/ Today we're announcing the stable Cua Driver release for Omarchy - a new foundation for computer use, built into the OS from the ground up.
Over the last month, we worked directly with @dhh, @SpencerGBull and @vaxryy to bring a native synthetic cursor to Omarchy's Hyprland compositor, enabling true multi-cursor computer use at the OS level.
Cua Driver is open source and available at github.com/trycua/cua
Stefan Wintermeyer retweeted
The wildly opposite ai programming takes are a sign the folks calling it over are missing what's possible, because they were limited by what they came from. Dream bigger!
others: "it's over, guess it's all rust from here"
me: "omg there's so many things I can build in Elixir"
Stefan Wintermeyer retweeted
Luiz André Barroso’s work influenced me a lot in how I think about systems, and even about my career.
I decided to write about his work with @JeffDean on some topics that interest me a lot: tail latency and the systems behind the modern internet. andreybleme.com/2026-09-22/l…
Stefan Wintermeyer retweeted
DHH opened #RailsWorld 2026 in Austin with a keynote on the age of AI agents: why 37signals has gone "pencils down" on handwritten code, why Rails' convention over configuration is built for this moment, and why the only play left is total optimism. youtu.be/vDjW_dRyKXY
Stefan Wintermeyer retweeted
dhh is famous for jumping too early into conclusions then changing his mind later: coffeescript vs stimulus, secrets vs credentials yml, yarn vs importmaps, mac vs linux… once he gets his enlightenment he starts preaching very loud
I asked Opus 5.5 to explain camera focus by building an interactive lens lab
Here's what it came up with after 1 hour 26 minutes in one shot, $25.66 API cost
lens.lab.sael.net
Move the focus ring and you can see the glass elements shift the sharp plane through the scene
Clearly, this @DHH Rails World 2026 keynote has become an instant classic. youtube.com/watch?v=V9SxpJpH…
Highlights:
- WebApps are dead since it is so cheap, easy, and fast to build native apps with agentic coding.
- No need for a framework like Ruby on Rails if you can achieve the same functionality with e.g. Rust on the backend while saving a lot of money by reducing the number of needed servers and having a faster application.
- Your application needs a CLI. Because agents love command-line tools.
In his Rails World 2026 keynote @DHH just said that Basecamp is not using Ruby on Rails for the new Hey version. Replaced the Ruby on Rails backend with Rust. I totally agree with his argumentation. But this must be a shock for many developers. Hell just froze over.
I just asked Claude Code to create a trailer for vutuv.de
I would never be able to create such a video. Never! WOW!
My mental model of @cooperx86 is that he edits Ruby and JavaScript newsletters all day long. Of course!
And then… every now and then… he comes up with something totally different.
Ich finde es krass, wie @robinalexander_ und @rosidaggi gefühlt aus dem Nichts (ok, mir ist schon klar, dass da Jahrzehnte Arbeit drinstecken) zu einer politischen 2-Personen-Podcast-Newsfabrik werden. Und es sieht auch noch alles so einfach und entspannt aus! Hut ab!
Stefan Wintermeyer retweeted
@ATT your system had an unknown error when transferring my eSIM between 2 phones and now the number works on neither of them. I need a transfer PIN but your website is broken and now my SMS doesn't work. I am in Germany physically. How, for the love of God, can I get my number moved off your godawful bullshit? Love, Scott.
Stefan Wintermeyer retweeted
🚀 Partner with PyCon Namibia 2027!
We’re looking for sponsors to help us grow Namibia’s Tech community and create an unforgettable conference experience. 🇳🇦🐍
🤝 Become a sponsor: na.pycon.org/2027/sponsors/p…
Let’s build the future of tech together! 💻✨
Stefan Wintermeyer retweeted
Honestly at this stage I'd be happy with no resets anymore but usable codex limits. I'd actually like to get a few days work out of my weekly limit. Not a few hours. Maybe GPT 6 Sol can change that who knows.
