CascadiaJS

CascadiaJS is coming back to Seattle, WA in 2026! 🔥 Join us as we dive into everything devs need to know to build on the open web in the era of AI. Blind Bird tickets are on sale NOW. Grab one and save $300 on tickets before they sell out! cascadiajs.com/2026

At @cascadiajs.com this year I gave a talk about #atproto and the Atmosphere: the open social ecosystem Bluesky and many other apps are built on, and what it means to actually own your data. I made a bunch of silly drawings for it, and I'm sharing them in this 🧵!

Karaoke still runs on technology from the '80s. 🛼 What if we rebuilt it with Web Audio, AI, open-source models, and modern web APIs? Watch @monteslu.com give one of the most delightfully nerdy talks from CascadiaJS 2026. youtu.be/wk2Fj2H5eoI

AI agents are getting real powers. Maybe they shouldn't have permanent credentials. @focusotter.bsky.social shows how human-in-the-loop authorization, scoped OAuth tokens, and short-lived permissions let agents act on your behalf, without giving away the keys to the 🏰. youtu.be/zRs08o4EP74

📦 What if bundling isn't the performance optimization it used to be? @moonmeister.net makes the case that HTTP/3 has changed the rules, and it's time to rethink decades of web performance advice around bundling, caching, and network requests. youtu.be/F7J-yaGQqJI

What if you could leave a social platform without leaving your community? @brittanyellich.com explains how the AT Protocol lets you own your identity, your data, and your social graph, opening the door to a more open, portable, and developer-friendly web. 🌐 youtu.be/_ZrChpf8FZ8

AI doesn't just hallucinate facts, it can hallucinate relationships. 🍄 Watch as @thenyahmacklin.bsky.social shows us how knowledge graphs and context graphs help AI agents reason more accurately, explain their decisions, and become systems you can actually trust. youtu.be/X_1EAwv_-Ow

AI can build your UI, but can it keep your brand consistent? 🎯 Watch as @kaelig.fr explains how design tokens give AI agents a shared source of truth, helping teams build interfaces that stay consistent across apps, platforms, and themes. youtu.be/CYy0PrnJISI

What happens when you fine-tune an AI on Beowulf, a 17th-century cookbook, and the history of Crisco? 📜 This talk from @mollyjeanbennett.bsky.social is a delightfully weird and thoughtful look at why making AI worse can actually make it more interesting. youtu.be/tBE8hQjj3KM

If AI only learns from yesterday's ideas, who creates tomorrow's? Marty Nelson makes the case for building software that breaks new ground, and shares how to help AI work with innovation instead of reinforcing the status quo. youtu.be/_pUpE2WM2zw

A live-coded morning rave is a memorable way to start a conference talk. 🪩 Watch as Alex Hinson shows how to build fast, private, task-specific AI tools with small local models, and why the right architecture matters more than simply calling the biggest LLM you can find. youtu.be/V_h_tMGgf6w

Will AI make programming languages irrelevant? 😲 Watch as Filip Sodić argues the opposite: as AI writes more code, strong type systems become even more valuable. youtu.be/WxhlRSfyxjY

Everyone wants to build AI tools. The hard part is proving they actually help. Watch as Jeff Otaño shares how OneBrief stopped chasing flashy demos, started measuring real outcomes, and used feedback loops to improve AI agents that fix production bugs. 🪲 youtu.be/LCKraOtFV-Q

AI may be changing software development, but it isn't replacing the need for junior developers. 🧑‍💻 Listen to Dylan Goings and learn why mentorship, diversity, and long-term knowledge transfer are more valuable than ever. youtu.be/S5XLYOsJ1u8

🧩 Design systems can't solve every UI problem. Watch as @jonathankeslin.com shares practical lessons for building shared components that scale across teams, with layered extensibility, sensible defaults, and escape hatches that keep both devs and products moving forward. youtu.be/haOndDHMGJQ

What happens when your "simple" API grows into an unmaintainable mess? 😅 This talk by @darius.cool explores the tradeoffs between configuration and composition, and why the right abstractions matter more than ever in the age of AI. youtu.be/dExasNlhVKM

What if AI agents use specs, not just prompts, to build software? Watch @ide.bsky.social, co-founder of @expo.dev, explain linked literate programming, a simple approach that keeps code, specifications, and intent in sync so AI can build more accurate, maintainable software. youtu.be/a8xYFd1ZLNQ

The best use of AI isn't writing code, it's helping you learn. 💡 Watch @daniel-mendoza.bsky.social's practical guide to mastering new frameworks by turning your AI assistant into a tutor instead of a code generator. youtu.be/foOOku3P9uQ

Ever click a button and wonder why your app freezes? 🤔 @cyatteau.bsky.social shows how web workers keep JavaScript apps responsive by moving CPU-intensive work off the main thread, with practical patterns for progress updates, cancellation, and debouncing. 📺️ Watch here! youtu.be/rh4RzLLPSis

Binge-watching this year's talk videos and getting serious FOMO? Don't miss out, join us in 2027! luma.com/cascadiajs-2...

AI coding agents are a lot like eager interns: they'll build exactly what you ask for... even when it's not what you meant 😅 In his CascadiaJS 2026 keynote, @erikch.bsky.social of AWS explains how spec-driven development helps teams get better results from AI coding tools. youtu.be/CGCLMky4OO8

We were so excited to have @biilmann.blog, the founder and CEO of @netlify.com, kick off CascadiaJS 2026 with a keynote on the arrival of AX. AI agents are becoming users of our products, and Matt shares why the next frontier isn't just UX or DX, but AX. youtu.be/EXeCOsIu0Ps

Talks from CascadiaJS 2026 are going up, and we're going to kick things off with the epic closing keynote from @t3.gg where he dropped lakebed.dev and talked about how it's time for developers to rethink... everything! youtu.be/TV6f2weVgCI

Keep the community vibes going at @SeattleJS.com tonight! Hang out with fellow devs and hear talks on open payments on the web and AI-driven development workflows. First 50 people who arrive get $10 off of food & drinks at Just the Tap! luma.com/wlumxv7f?lm_...

This week I had the chance to attend #CascadiaJS. It was the first developer conference I’ve ever attended, and I’m still reflecting fondly on the experience. Thank you, @cascadiajs.com. Already looking forward to the next one. #CascadiaJS #SoftwareDevelopment

One of the best things that came out of @cascadiajs.com is this gif lmao @francescociulla.bsky.social

Posted some notes on @cascadiajs.com to my blog @graham.systems did I do this right? I installed and setup the @atmosphere.community plugin from @automattic.com. It doesn't look like a @standard.site card though, but maybe it's fine. www.tomresing.com/2026/06/04/f...

Wrote a good old-fashioned post-conference reflections post about @cascadiajs.com. You should read it! www.knut.fyi/blog/2026-06...

Such an epic conference! As always, I learned so much, met so many awesome people, and left more inspired than ever to go home and build cool things

CascadiaJS 2026 is a wrap! Thank you to our speakers, sponsors, staff, attendees and everyone who supported us along the way to make this event happen. We put 💯 Blind Bird tickets for CascadiaJS 2027 on sale, grab one before they sell out and lock-in your spot! 🌲 luma.com/cascadiajs-2...

As we were singing karaoke last night at @cascadiajs.com wrapping up a great conference, hours earlier we learned origin story or low-res imagery alongside karaoke songs. Why does this 1986 CD+G format still exist, and what’s a modern take on what you can build today? Check out Luis’ project.

Fun folks at @cascadiajs.com got me to do karaoke for the first time ever...

Thank you, Tom! I had so much fun at @cascadiajs.com

@cascadiajs.com was amazing. Thank you for the opportunity to speak to the amazing community, thank you to @storyblok.com for supporting me, and thank you all who attended my talk. The speakers, community, ans organizers are amongst the most passionate that I have ever encountered. Thank you ❤️

Welcome!

Thanks to CopilotKit for being a Gold Sponsor at CascadiaJS 2026 this year ❤️ CopilotKit is the agentic frontend stack & the company behind the AG-UI protocol. It's the easiest way for bring AI functionality (like Generative UI) to full stack apps. Learn more at: cascadiajs.com/2026/sponsor...

Harmonizing/screaming with super fun folks is always a great way to wrap up a tech conference. 😆🔥 @cascadiajs.com #CascadiaJS

I've been 👻 public work/tech/web spaces for *a while* but I'm popping my head up for @cascadiajs.com! I'm a frontend-focused engineer, utterly confused at what my job will look like in 2-3 years 😂 Would love to say hi and meet new faces too 👋 #cascadiajs

Second day of @cascadiajs.com. Had a great time yesterday meeting a bunch of new friends. Hoping for more today. Looking forward to @brittanyellich.com's talk on ATProto and @moonmeister.net performance talk.

We made a new friend at @cascadiajs.com ! Fue un gusto, Lily! #auth0 #CASCADIAJS

Dang boiii! @francescociulla.bsky.social absolutely killed his keynote!! I *almost* want to give Rust a try. 😜😜😜 @cascadiajs.com #CascadiaJS

Learning how to make bad language models from @mollyjeanbennett.bsky.social at @cascadiajs.com Leading with humor. Great audience response!

Quick conference selfie with @carter.rabasa.com - having a great time at @cascadiajs.com!!