RubyConf Austria @RubyConfAT

Hey rubyists, here's the best way to play with these new decision models like JEV from @typesafeai Full-featured, and future-proof. Introducing github.com/obie/ruby_deci…

RubyLLM 2.0 is out! 💎 - Responses API - Citations - Tool Approval - Batches - Model Fallbacks - Video and Speech Generation - Provider Tools - Deep Research - Tokenization and Token Counting - Workflow Instrumentation and much much more. All the new features in this release are in red. 👇 rubyllm.com/whats-new-in-2…

Vienna.rb #68 is a wrap! 🎉 Great talks, tasty pizza, great vibes - and a raffle to top everything off. What more could you ask for? Thanks to our speakers, Platogo for hosting us once again, and everyone who showed up - newcomers especially! 🤗 See you in December!

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Huge thank you to our friends at Platogo, who are - once again - hosting this Thursday's Vienna.rb! These meetups wouldn't be possible without you! 🤗 Come join the fun. We have Pizza! 🍕 meetup.com/vienna-rb/even…

Done ✅ Officially released all four gems I intended to release over the weekend. Will be actively maintained and evolved until the point of being the best tooling for the job at hand :) At least for me and my workflows, which is why I'm working on them in the first place. Hopefully you find them useful. Links to repositories in the thread below 👇

Save the date! Vienna.rb is back with incredible talks and great vibes! See you at Platogo on the 3rd of September! ✌️

Thanks to @evilmartians and their Ruby/Rails LLM discoverability scorecard, guides.rubygems.org now serves a sitemap, llms.txt, and raw Markdown for every page. Add .md to any guide URL to get the text without the markup. blog.rubygems.org/2026/08/06/mak…

I'm excited to share the early access release of my upcoming book, Regenerative Software, which will be released in full early next year by O'Reilly, one of my all time favorite tech publishers! As a self-taught developer, I learned a lot of what was foundational to my career from early O'Reilly books on UNIX, Perl, sed, awk, etc. Thrilled to finally have one of these animal covers with my name on it. (link in thread)

Hot take: Ruby is the best language for building AI web apps.

RubyConf Austria @RubyConfAT

2 months ago

Is #Ruby the best language for building AI web apps? @paolino , creator of RubyLLM, makes the case: LangChain vs RubyLLM side by side, and zero to a streaming #Rails chat UI in a two-minute live demo. youtu.be/t1XAy8HKvnY

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Keynote speaker by morning, saxophonist by night: @chadfowler closed day two at the piano and on a saxophone from David S. Ware's estate — with a Vienna story 30 years in the making 🎷 youtu.be/PCoSQgjFcWE

A conference talk that's also a clarinet duet 🎶 Dalma Boros & Jess Sullivan on saying yes to a surf trip with strangers — and everything that followed: a book club, hallway.party, and a first CFP that became this talk. youtu.be/tYkvHE_j-vI

Is #Ruby the best language for building AI web apps? @paolino , creator of RubyLLM, makes the case: LangChain vs RubyLLM side by side, and zero to a streaming #Rails chat UI in a two-minute live demo. youtu.be/t1XAy8HKvnY

15 years of #Rails + DDD — and why those lessons matter more than ever now that AI agents write code. @andrzejkrzywda on small read models, domains & processes, kept honest by Packwerk, RuboCop & Mutant. youtu.be/zewTY3J42DU

Five lightning talks, five minutes each, one clap-off rule ⚡ @chikahirotokoro , @lreszke, @callmesangio, @RadanSkoric & @pragdave on OSS strategy, event sourcing, a lovable URL shortener, a Hotwire inspector, and picjs. youtu.be/tii5S9vq1eU

A quiet moment from day two: pianist Iman Jahić Hošić invited the room to slow down with a two-piece set at the grand piano of Das MuTh 🎹 youtu.be/0KaWnFykEv4 #RubyConfAT #Vienna

My keynote speech from @RubyConfAT 2026, recorded live on May 30, 2026 at Das MuTh theatre in Vienna. “Obie Fernandez — author of The Rails Way and Patterns of Application Development Using AI, CTO at ZAR — tells the story of two chefs in two very different kitchens, building a fintech together with AI. One chef is Sebastian, ZAR's lead architect: a perfectionist running a Michelin-star kitchen, where almost every line of ZAR Core — a stablecoin wallet serving underbanked populations across a 60+ country roadmap — touches users' money. The other is Obie: idealist, delegator, running three or four Claude Code sessions at once on internal tools, never reading every line, wearing the --dangerously-skip-permissions t-shirt on stage. "I'm a control freak and you're a free spirit." What they share: a total intolerance for technical debt. What differs is when they pay — Sebastian up front, with planning and specifications; Obie afterwards, with cleanup passes he finally has the bandwidth to make. Highlights: • The cautionary tale: kr8d, a vibe-coded fun-employment app that collapsed under its own featureweight • Sebastian's kitchen by the numbers: a single 37,000-line cleanup PR, deleting five lines for every line added — while features keep shipping • Obie's kitchen: five Rails apps, 1000+ commits, 400k+ lines in five months — Nexus, Agentis, Imperium, and Eventis, an event bus that's an active participant in the conversation • The /goal workflow: plan, implement, ship, deploy, verify — then walk to the cafe and supervise from your phone • Compounding: every problem you solve should make the next one cheaper — 75 custom skills, /fresh, /ship, and a skill that writes skills • The two-week Flutter → React Native rewrite the team said would take two months • Why Rails conventions matter more than ever: every shape choice you leave open is an invitation for the model to get non-deterministic • Open source from ZAR: Servus (a disciplined, schema-validated service-object pattern), Amounts (fungible amounts with units and type safety), and Praxis (conceptual linting — RuboCop at the level of intent, not syntax) • The uncomfortable truth about code review in the agent era — and why automated constraints will save us from ourselves "Don't tolerate debt. It's not needed anymore." youtu.be/7QrXGLSZHvE?si…

I published ruby.evilmartians.com Ruby LLM Discoverability Scorecard after watching @chadfowler 's talk at @RubyConfAT - to ensure that we, the @rubylangorg and @rails community, do our best to be in training data and in agent retrieval. Just updated the data. Here's what's improved in 30 days: - llms.txt +3: @_maintainable , @AppSignal , @flydotio - content negotiation +1 @AppSignal - .md route:+1 @AppSignal - sitemap: +2 @bridgetownrb @any_cable - robots allows AI: +1 Karafka @maciejmensfeld Good job!

"You're not writing Ruby right now. You're writing C++ with a Ruby syntax." @pragdave closed #RubyConfAT 2026 with a challenge: classes are evil, your job class is just a function, and ActiveRecord::Base's 834 methods are not an "is-a" relationship. ▶️ youtu.be/hC943MiL0lg

He deleted his slides an hour before going on stage. It got better from there 🎤 @bbatsov : 14 years of RuboCop, 330 releases, zero breaking changes since 1.0 — and Rubydex integration that makes it "suddenly, magically smarter." Also: many hot takes. youtu.be/h_NazJbUBPA

An event bus is just a mutex, a queue, and a thread. The rest is discipline. Ljubomir Marković at #RubyConfAT 2026: from a naive bus in a few lines of #Ruby to TCB, a gem that fits your whole domain in one file — demoed on a live drum sequencer 🥁 ▶️ youtu.be/bFGcJ5kOrOc