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René Wilby

@rene-wilby.de
221 followers 245 following 285 posts

Freelance senior software engineer, family father, music and coffee lover, European 🇪🇺, he/him. rene-wilby.de/en

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René Wilby @rene-wilby.de · 10/12/2025
Hey boys and girls @certificates.dev 👋 I tried to take an React exam today, but there was a network error and I couldn't continue. Now my dashboard says "Exam in progress" and I'm stuck. I need to take this exam today, can you please help me? 🙏 @aurorascharff.no
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Nadia Makarevich @adevnadia.bsky.social · 04/12/2025
Who's ready for another investigative deep dive? 🕵🏻‍♀️ If you've ever been frustrated by how much JavaScript your React app ships, here's a step-by-step guide on investigating and fixing it 💪🏼 As usual, easy to read and lots of hands-on examples. www.developerway.com/posts/bundle...
developerway.com
Bundle Size Investigation: A Step-by-Step Guide to Shrinking Your JavaScript
A practical guide to analyzing and reducing JavaScript bundle size. Learn bundle analysis, fix tree-shaking issues, remove duplicate libraries, and otherwise optimize your React app's JavaScript size.
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René Wilby @rene-wilby.de · 26/11/2025
I had a great time talking at XtremeJ 2025 @xtremej.bsky.social! Very nice to meet you Haim Michael (@lifemichael.bsky.social) and thank you for organising this event! youtu.be/MgXpWfvFSWY?...
youtu.be
Bridging the Gap: Seamless and Type-Safe Communication between Spring Boot and React | René Wilby
YouTube video by XtremeJ Conference
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Jakub Chrzanowski @chrzanowski.info · 26/11/2025
Did you know @jetbrains.com created several playlists with music for coding? 🎶 For me, Pure Flow and Lo-Fi work the best! Spotify 👉 open.spotify.com/user/31wtooe... YouTube Music 👉 music.youtube.com/channel/UCGp...
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Nadia Makarevich @adevnadia.bsky.social · 24/11/2025
Launching a 30% discount on my books "Advanced React" & "Web Performance Fundamentals" starting now! Perfect time to level up your React & Web Perf skills 💪🏼 There is also a secret code to turn it into 50% if there is a need 😉 Look for it in the FAQ section of the websites 👇🏼
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Aurora Scharff @aurorascharff.no · 17/11/2025
Going back through @ricky.fm's Async React as I prep an internal talk, and this part is insanely good, felt like it deserved a reshare🔥 youtu.be/p9OcztRyDl0?...
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René Wilby @rene-wilby.de · 13/11/2025
I'm very happy about the evaluation of my talk at this year's W-JAX conference: Quality of the talk: 4.67 (4.07) Speaker's knowledge: 4.5 (4.38) The number in parentheses is the avg of all talks/speakers of the conference. Rating is 1 to 5 with 5 being the best. That motivates me to keep going!
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René Wilby @rene-wilby.de · 13/11/2025
This is going to be my first #jaxcon, and I'm really looking forward to give two talks about React, React Native and Spring Boot 🎉 🙌
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Márton Braun @zsmb.co · 11/11/2025
📢 Rare opportunity: my team is hiring! We're looking for a new Developer Advocate to cover server-side Kotlin, focusing on Spring. If you love Spring, Kotlin, and their communities, this might just be for you. Learn more and apply here:
job-boards.eu.greenhouse.io
Kotlin Developer Advocate
Amsterdam, Netherlands; Berlin, Germany; Dubai, United Arab Emirates; Limassol, Cyprus; London, United Kingdom; Madrid, Spain; Munich, Germany; Prague, Czech Republic
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Jonathan Bones @bonesyblue.bsky.social · 08/11/2025
I'm preparing my Star Wars themed talk on TanStack DB for next week's React(Native) Kiel meetup. If you're around in Kiel on Monday evening, feel free to join us for some nerdy fun! ⚛️ www.meetup.com/kiel-react-n...
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René Wilby @rene-wilby.de · 06/11/2025
Time for an update about the latest and greatest in React by @nilshartmann.net at W-JAX conference (@jaxkonferenz.bsky.social)
Nils Hartmann giving a talk
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René Wilby @rene-wilby.de · 06/11/2025
Next up at W-JAX conference (@jaxkonferenz.bsky.social): Advanced Spring Security Use Cases by @cschuszter.bsky.social
Christian Schuszter giving a talk at the conference
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René Wilby @rene-wilby.de · 06/11/2025
Kicking off day 3 at W-JAX conference (@jaxkonferenz.bsky.social) with an insightful talk from @patbaumgartner.com about Spring Boot Observability.
Patrick Baumgartner giving a talk
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René Wilby @rene-wilby.de · 06/11/2025
Let's go W-JAX 2025 (@jaxkonferenz.bsky.social) 🎉
Conference shirt and speaker badge
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Certificates.Dev @certificates.dev · 03/11/2025
Stand a Chance to Win a React Mid-Level Exam Voucher! 🎉 Be the lucky dev that gets access to our React mid-level prep guide, exam & discord community for FREE! 🥇Winner announced 14 Nov. 🎁Bonus entry: RT this post Enter here👇 go.certificates.dev/gwy
go.certificates.dev
Win a React Certification Exam Voucher!
pemGet ready to validate your React skills – for FREE! 🎓/embrbrTo celebrate our upcoming a target="_blank" rel="noopener noreferrer" href="https://certificates.dev/react/free-weekend"strongReact Free Weekend/strong/a, we’re giving away a target="_blank" rel="noopener noreferrer" href="https://certificates.dev/react"strongone React Mid-Level Developer Exam Voucher/strong/astrong!/strongbrbrPrize Includes:br✅em /emstrongMid-level React Exam Voucher/strong-em Your access to take the Certified Mid-level React Developer exam./embr📘em /emstrongPreparation Guide Access/strong em- A comprehensive curriculum that covers all topics required to pass the exam with confidence./embr💬em /emstrongDiscord Community Access /strongem- Join a community of developers to ask questions, share insights, and get expert advice while preparing to get certified./embrbrWhether you're just starting out with React or already have experience, this is your chance to strongprove your skills and earn recognition/strong from the only a target="_blank" rel="noopener noreferrer" href="https://certificates.dev/react"strongReact certification/strong/a program designed by experts for developers like you./p
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VoidZero @voidzero.dev · 30/10/2025
We raised a $12.5M Series A round, led by Accel. In this next stage, VoidZero is accelerating development on both our open-source projects and Vite+, the unified JavaScript toolchain. This is only the beginning! → voidzero.dev/posts/announ...
voidzero.dev
VoidZero Raises $12.5M Series A
VoidZero raised $12.5 million in Series A funding to accelerate product development.
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René Wilby @rene-wilby.de · 17/10/2025
Goodbye Hilla 👋 @vaadin.com recently announced the discontinuation of Hilla as a stand-alone product. To me, this marks the end of an ambitious project and a personal journey. rene-wilby.de/en/blog/good...
rene-wilby.de
Goodbye Hilla 👋
Vaadin recently announced the discontinuation of Hilla as a stand-alone product. To me, this marks the end of an ambitious project and a personal journey.
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René Wilby @rene-wilby.de · 10/10/2025
Just finished: 7 km, 36:45 min 🏃‍♂️ Personal best time in 2025 375 km so far in 2025 #happy
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Nicolas Fränkel 🇪🇺🇺🇦🇬🇪 @frankel.ch · 30/09/2025
#OpenAPI 3.2.0: Evolving with Modern API Patterns
medium.com
OpenAPI 3.2.0: Evolving with Modern API Patterns
The OpenAPI Specification has released version 3.2.0, bringing several important improvements that reflect how APIs have evolved in recent…
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René Wilby @rene-wilby.de · 29/09/2025
Existing times ahead 🚀 4 conference talks in the next 3 months: * 21.10.2025: Vaadin Create * 04.11.2025: XtremeJ * 06.11.2025: W-JAX * 09.12.2025: IT-Tage Really looking forward to meeting new people and old friends, as well as sharing my knowledge with the great developer community.
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René Wilby @rene-wilby.de · 14/08/2025
Ich freue mich sehr auf die W-JAX! #Java #SpringBoot #React #Hilla
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René Wilby @rene-wilby.de · 08/08/2025
That was fun 🤓 I had a great time talking to @cat-edelveis.bsky.social about Full-Stack, AI and personal growth. Thanks for inviting me to the #CyberJAR channel. www.youtube.com/watch?v=tqga...
youtube.com
Full-stack: Hassle-free software development or the abyss of complexity?
YouTube video by CyberJAR
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Catherine Edelveis @edelveis.dev · 06/08/2025
Today, in just 4 hours, we are discussing myths and realities of full-stack. Join us if you are thinking of changing career direction, have stories to share, or just curious😉
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René Wilby @rene-wilby.de · 04/08/2025
Upcoming livestream on Wednesday 🗓️: Join @cat-edelveis.bsky.social and me for a relaxed talk about the challenges of full-stack development, how it can help developers to build better apps and what skills really matter in the age of AI. #Java #Spring #Vaadin #React www.youtube.com/watch?v=tqga...
youtube.com
Full-stack: Hassle-free software development or the abyss of complexity?
YouTube video by CyberJAR
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René Wilby @rene-wilby.de · 29/07/2025
I didn't know there was a name for this type of AI generated content: #AI #Slop Great take by @lastweektonight.com with John Oliver www.youtube.com/watch?v=TWpg...
youtube.com
AI Slop: Last Week Tonight with John Oliver (HBO)
YouTube video by LastWeekTonight
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René Wilby @rene-wilby.de · 28/07/2025
Did you ever wonder which JVM could be the best for your #Vaadin web app? Check out this blog post for a detailed comparison of popular JVMs and how their unique characteristics can help to reduce start-up time, latency, memory usage and more. vaadin.com/blog/best-jv...
vaadin.com
Choosing the JVM that powers your Vaadin application | Vaadin
Discover the best JVMs for Vaadin apps. Compare memory usage, GC performance, startup time, and scalability for cloud and container deployments.
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René Wilby @rene-wilby.de · 25/07/2025
A really insightful talk about null safety in #Java and #Spring. @seb.deleuze.fr demonstrates how #JSpecify and #NullAway add great value to new and existing projects by turning a design issue of Java into a feature that increases stability and trust in our code bases. youtu.be/otwr0IniwRk
youtu.be
Null Safety in Spring Applications With JSpecify and NullAway by Sébastien Deleuze
YouTube video by IntelliJ IDEA, a JetBrains IDE
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René Wilby @rene-wilby.de · 24/07/2025
See #Vaadin #Flow (and other Ul frameworks) in action to create a Meme Generator (web) app. Nice presentation and live coding by @jagovreede.bsky.social.
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René Wilby @rene-wilby.de · 21/07/2025
Am 28.07. spreche ich in einem kostenlosen Webinar bei der GFU Cyrus AG über die effiziente Full-Stack-Entwicklung von Single Page Applications mit #Java, #SpringBoot, #TypeScript und #React. Weitere Informationen zum Vortrag und zur Anmeldung gibt es hier 👉 www.gfu.net/s5162
gfu.net
Vortrag Unterschiede überwinden: Spring Boot und React nahtlos integrieren
Vortrag am 29.07.2025
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Simon Martinelli @martinelli.ch · 18/07/2025
Spec-Driven Development with AI: A New Approach and a Journey into the Past martinelli.ch/spec-driven-...
martinelli.ch
Spec-Driven Development with AI: A New Approach and a Journey into the Past - Martinelli
The software development world is buzzing about AI-assisted coding. Tools like GitHub Copilot and Claude Code promise to make us more productive. But most approaches focus on generating code faster – ...
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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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René Wilby @rene-wilby.de · 15/07/2025
Awesome 👏👏👏
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René Wilby @rene-wilby.de · 15/07/2025
Good news for app developers using the OAuth Authorization Code Flow with GitHub: PKCE (Proof Key for Code Exchange) is finally supported now. This increases the security and removes the complexity of workarounds. github.blog/changelog/20...
github.blog
PKCE support for OAuth and GitHub App authentication - GitHub Changelog
PKCE (Proof Key for Code Exchange) is now supported and recommended for user authentication in OAuth and GitHub Apps. This OAuth 2.0 standard (RFC 7636) helps protect authorization codes issued…
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René Wilby @rene-wilby.de · 08/07/2025
New blog post: Describing and comparing four approaches to implement the common Master-Detail-View pattern for business web apps using #Hilla (by @vaadin.com). rene-wilby.de/en/blog/hill...
rene-wilby.de
Hilla and the Master-Detail-View pattern
Describing and comparing four approaches to implement the common Master-Detail-View pattern for business web apps using Hilla.
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René Wilby @rene-wilby.de · 30/06/2025
New blog post: How to produce Kafka messages from user inputs in a web app using #SpringKafka, #SpringBoot, #React and #Hilla (by @vaadin.com) 👇 rene-wilby.de/en/blog/hill...
rene-wilby.de
Hilla and Kafka. Part 2: Producing messages
Creating Kafka messages using Hilla's first-class form support and type-safety in the frontend and Spring Kafka and Spring Boot's auto-configuration capabilities in the Hilla backend.
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René Wilby @rene-wilby.de · 25/06/2025
Today, we had to convert a #Hilla web app to Spring MVC and Thymeleaf. So much more boilerplate code, less type-safety, a poorer DX ... 😔 Really a sad day in the project. As a freelancer, I have to accept those decisions, but I will continue to advocate for efficient full-stack-development.
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René Wilby @rene-wilby.de · 23/06/2025
New blog post: How to consume and display Kafka messages in a reactive way using #SpringKafka, #SpringBoot, #React and #Hilla (by @vaadin.com) 👇 rene-wilby.de/en/blog/hill...
rene-wilby.de
Hilla and Kafka. Part 1: Consuming messages
Consuming Kafka messages using Spring Kafka and Spring Boot's auto-configuration capabilities in the Hilla backend and displaying these messages in the Hilla frontend UI in a reactive way.
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Vaadin @vaadin.com · 19/06/2025
Ready to ship modern, accessible #Java apps faster? Vaadin 24.8 has just landed – with smarter tools, new components & better UX out of the box! See what’s new 👉 vaadin.com/blog/vaadin-...
vaadin.com
New components, less boilerplate — what’s new in Vaadin 24.8 | Vaadin
Vaadin 24.8 helps full-stack Java developers build modern apps faster with reactive UIs, smarter file handling, and built-in DevOps tools. See what's new!
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Sebastian Kuehnau }> @seb-vaadin.bsky.social · 19/06/2025
Vaadin 24.8 is here 🎉 ✨ Signals in Flow (feature flag) 📥 Upload & download made easy 🃏 Card component 📝 Markdown support 🧩 Better Forms & Master-Detail 🧠 Copilot reads your Figma custom components 💬 Kotlin nullability in Hilla 🔗 github.com/vaadin/platf...
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René Wilby @rene-wilby.de · 16/06/2025
I recently had the pleasure to join a very nice panel discussion with @frankdelporte.be, @richard.fichtner.dev and @martinelli.ch about starting new Java projects. Check out the recording youtu.be/eUVaOlRlulA and the corresponding report pages.vaadin.com/java-project... conducted by @vaadin.com
youtu.be
Starting Java projects: lessons from the field
YouTube video by vaadinofficial
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René Wilby @rene-wilby.de · 12/06/2025
Today I had a long conversation with GitHub Copilot Chat about an OAuth configuration issue of a Spring WebClient that is used in a service application. Unfortunately, this conversation was not helpful, because Copilot continuously hallucinated things kept going round in circles. I #RTFM instead 🤓
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René Wilby @rene-wilby.de · 12/06/2025
Es war ein toller Abend und hat wirklich Spaß gemacht. Danke für die tolle Organisation und die netten Worte :)
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René Wilby @rene-wilby.de · 10/06/2025
Morgen Abend, 18:00 Uhr, DevTalk@TK, Hamburg: Effektive Full-Stack-Entwicklung mit #React und #SpringBoot. Es sind noch Plätze frei. 👇 #LiveCoding www.meetup.com/devtalk-tk/e...
meetup.com
Unterschiede überwinden: Spring Boot und React nahtlos integrieren, Wed, Jun 11, 2025, 6:00 PM | Meetup
Hallo DevTalk@TK-Meetup, am 11. Juni laden wir Euch wieder in die Techniker Krankenkasse ein. Wir freuen uns auf einen Abend mit einem Vortrag von **René Wilby** zu Spring
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Marcus Hellberg @marcushellberg.dev · 29/05/2025
It’s official: #VaadinCreate 2025 IS HAPPENING! 🥳 vaadin.com/vaadin-crea...
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Marcus Hellberg @marcushellberg.dev · 27/05/2025
Keep calm and build web apps. Thanks for the fan art, @alina-yurenko.bsky.social‬!
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René Wilby @rene-wilby.de · 16/05/2025
I'm really looking forward to talking about productive and efficient development of Single Page Applications with React, TypeScript, Spring Boot and Java at DevTalk@TK on 11 June. Check out the link for more details and RSVP 👇 www.meetup.com/devtalk-tk/e...
meetup.com
Unterschiede überwinden: Spring Boot und React nahtlos integrieren, Wed, Jun 11, 2025, 6:00 PM | Meetup
Hallo DevTalk@TK-Meetup, am 11. Juni laden wir Euch wieder in die Techniker Krankenkasse ein. Wir freuen uns auf einen Abend mit einem Vortrag von **René Wilby** zu Spring
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Gergely Orosz @gergely.pragmaticengineer.com · 11/05/2025
In 2014, Russia started an unprovoked war on Ukraine, aiming to seize all of Ukraine. It launched an all-out invasion in 2022. I do not understand how anyone can possibly be taking the side of Russia and Putin. This war is not “self defense:” it is brutality and war crimes.
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René Wilby @rene-wilby.de · 10/05/2025
I built a wooden playhouse in the garden for my little daughter.
Wooden playhouse in the gardenWooden playhouse in the gardenWooden playhouse in the gardenWooden playhouse in the garden
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Led By Donkeys @ledbydonkeys.org · 07/05/2025
TANK vs TESLA "We've crushed fascism before and we'll crush it again" - ⁠WW2 veteran Ken, 98, in the tank
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Sebastian Kuehnau }> @seb-vaadin.bsky.social · 07/05/2025
🎉 @vaadin.com @ @devoxx.uk ! 🇬🇧 We’re excited to have a booth at Devoxx UK this week in London! Come by, say hi 👋, and discover what’s new with Vaadin.
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