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Joonas Lehtinen

@joonas.bsky.social
99 followers 19 following 16 posts

Web. AI. Open Source. Enterpreuner. Vaadin Co-founder. CS PhD. SF Bay Area. Dad & husband.

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Joonas Lehtinen @joonas.bsky.social · 10/09/2025
It took way too long, sorry.
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Joonas Lehtinen @joonas.bsky.social · 10/09/2025
We taught AI a new modality @vaadin.com — UI In Computer–Human Interaction, the AI decides what it needs from a human, and builds the UI on the fly — adapting in real-time as the human interacts. Try it → computerhumaninteraction.com
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Joonas Lehtinen @joonas.bsky.social · 31/08/2025
THANK YOU for reporting! Look like some pages work and some return 503.
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Reposted by Joonas Lehtinen
Serhii Kulykov @iamkulykov.bsky.social · 27/08/2025
10 years of building Web Components at @vaadin.com: celebrating the "anniversary" of <vaadin-combo-box>! Check out this blog post to learn about our journey and how we finally migrated to @lit.dev: dev.to/webpadawan/1...
dev.to
10 years of building Web Components: the story of <vaadin-combo-box>
A story about building Vaadin web components
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Reposted by Joonas Lehtinen
Marcus Hellberg @marcushellberg.dev · 29/07/2025
🚀 Updated Vaadin MCP ✨ Combines semantic + keyword search with reranking 🛠️ MCP Tools Available: 📚 get_vaadin_primer - Vaadin fundamentals & best practices 🔍 search_vaadin_docs - Search Vaadin docs 📄 get_full_document - Complete doc retrieval 🏷️ get_vaadin_version - Latest stable version info
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Joonas Lehtinen @joonas.bsky.social · 18/07/2025
You might not want to commit generated folder...
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Reposted by Joonas Lehtinen
René Wilby @rene-wilby.de · 16/07/2025
New blog post: Using Kafka Streams and Interactive Queries to consume, aggregate and query streaming data in business web apps built with #Hilla (by @vaadin.com). rene-wilby.de/en/blog/hill...
rene-wilby.de
Hilla and Kafka. Part 3: Kafka Streams
Using Kafka Streams and Interactive Queries to consume, aggregate and query streaming data in the Hilla backend and visualize the data in the Hilla frontend in a reactive way.
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Joonas Lehtinen @joonas.bsky.social · 15/07/2025
I would like to avoid any politics — it is a slippery slope that will distract focus quick.
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Joonas Lehtinen @joonas.bsky.social · 15/07/2025
Chinese, Finnish, German, and Spanish translations for @vaadin documentation is now live. More languages will be added in August.
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Reposted by Joonas Lehtinen
Johannes Rabauer @rabauer.dev · 04/07/2025
I'm starting a new live coding series! 🧠 Build a local AI chatbot in pure Java ⚙️ With Spring AI, Vaadin UI & Docker 🧙 It's a text adventure game with stats, magic, inventory, and AI-generated ASCII art. Follow along if you’re into #Java + #AI! #SpringBoot #Vaadin #LiveCoding
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Joonas Lehtinen @joonas.bsky.social · 25/06/2025
Hard to reason with that. Hopefully the organization will learn at some point of time that modern software development practices save money and deliver better results. Then you can reverse the rewrite commit :)
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Joonas Lehtinen @joonas.bsky.social · 29/03/2025
Vibe coding feature (prototype) in @vaadin.com Copilot is magical. Rudolf the red nose agent really builds the full Spring app for you… youtu.be/rBX_ZPvPfN0
youtu.be
Vaadin Copilot AI Pair Coder Prototype
YouTube video by vaadinofficial
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Joonas Lehtinen @joonas.bsky.social · 20/03/2025
Thank you!
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Reposted by Joonas Lehtinen
Vaadin @vaadin.com · 19/03/2025
Vaadin 24.7 = faster dev, stronger security, smarter automation! ✅ Flow: Resilient server-client messaging ✅ Hilla: React 19 support ✅ Copilot: Custom components & automation ✅ Control Center: Now GA! + more updates! 🔗 See what's new: vaadin.com/blog/vaadin-...
vaadin.com
24/7 Flow with Vaadin 24.7 | Vaadin
Vaadin 24.7 is here! Simplify upgrades, enhance security, and accelerate development. Upgrade now and keep coding 24/7!
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Reposted by Joonas Lehtinen
Vaadin @vaadin.com · 27/02/2025
How do teams choose the right tech for #Java apps? We’re running a quick survey—not just on what tools teams use, but why. Your insights will help the community make better decisions in 2025! 🔗 Join the survey: survey.survicate.com/8dd6ee2a0565...
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Joonas Lehtinen @joonas.bsky.social · 20/02/2025
It’s disheartening to see such tone-deaf cruelty from an official White House communication.
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Joonas Lehtinen @joonas.bsky.social · 20/02/2025
And it is not even that: $2.5M of the $8M contract _limit_ was already spent. Thus, the maximum saving would have been the remaining $5.5M. In other words, actual saving is less than 0.07% of what DOGE claimed.
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Joonas Lehtinen @joonas.bsky.social · 06/02/2025
Kahneman’s “Thinking, Fast and Slow” has a parallel in AI: • System 1: LLMs produce a rapid stream of thought • System 2: Reasoning models think before answering
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Joonas Lehtinen @joonas.bsky.social · 26/01/2025
Vaadin community releases a plugin update daily in average and adds a completely new plugin almost weekly. With over 2000 plugins to choose from, community really elevates Vaadin. This is Open Source in practice. Kudos @samiekblad.bsky.social for leading Directory! youtu.be/D5JbB5nf3qk?...
youtu.be
Vaadin Directory Wrapped 2024
YouTube video by Sami Ekblad
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Reposted by Joonas Lehtinen
Marcus Hellberg @marcushellberg.dev · 06/12/2024
🤖 @tzolov.bsky.social created a cool demo showing off OpenAI gpt-4o-audio and Spring AI and said it could use a better interface. Ask, and you shall receive. Introducing Marvin, the paranoid UI 😆 github.com/marcushellbe...
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Joonas Lehtinen @joonas.bsky.social · 04/12/2024
One year ago, I rejoined Vaadin to help guide the product in a fresh new direction. I'm immensely proud of what our team has achieved over the past 12 months. Five weeks ago, I had the privilege of summarizing what we build at our annual user conference. 12-minute recap: youtu.be/lWbLQda_aPU?...
youtu.be
Full stack level up: what’s next for Vaadin by Joonas Lehtinen - Vaadin Create 2024
YouTube video by vaadinofficial
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Joonas Lehtinen @joonas.bsky.social · 06/11/2024
Copy-paste from Figma to @vaadin.com www.figma.com/community/fi...
figma.com
Figma to Vaadin | Figma
Generate Vaadin UI code by copy-pasting designs from Figma. Works with Vaadin Flow (Java) and Hilla (React). This file documents the feature and offers few sample UI's that can be used for testing or ...
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Joonas Lehtinen @joonas.bsky.social · 06/05/2023
Hello world!
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