Credo 1.7.15 is out now, with massive perf improvements for large #ElixirLang codebases.

statmodeling.stat.columbia.edu/2025/12/24/s... Some new insights here and there on why it feels offensive when somebody copypastes a ChatGPT reply verbatim.

100 concurrent PDF renders completing in ~22ms total, how cool is that? #ElixirLang #PDF #typst

The type system progress stuff is exciting!

Very excited to dig into this, @jkwa.bsky.social! #ElixirLang

Somebody at work referred to me as “the frontend guy.” We’re cooked. 👀😅

Speaking publicly about Elixir stuff (conference talks + podcasts) has gotten me every job I've had since 2020. (And that first one was a 50% pay bump.) I interview pretty poorly, but having been seen being smart in public got me the foot in the door I needed to prove I could do the work.

Another talk where the speaker is really into using web components (and Lit) whenever LiveView falls short: www.youtube.com/watch?v=mEnN...

We're launching our new Elixir book! 🎉 Programming Nerves: from web developer to hardware maker. If you've ever been curious about hardware but felt intimidated, this is for you. Beta available now (38% off), or download free chapters to get started. #ElixirLang

Couldn't fit optics in my book, but I can build them into Funx. Here's why lawful lenses matter (even in Elixir): www.joekoski.com/blog/2025/12... #elixirlang

BRB, gotta go write a migration for the work DB.

Loved this talk.

Async tests are great… until shared global state ruins your day. In this new article, @marpo60.bsky.social breaks down how using ProcessTree gave each test its own isolated environment — solving flakiness and making async tests safe again. 👉 www.mimiquate.com/blog/how-pro... #Elixirlang

My #1 takeaway from the 2025 Elixir survey: Quokka is up-and-coming, but not big enough (3.8%). If you're using Credo but not Quokka, you're missing out. elixir-hub.com/surveys/2025

Published a little LiveDashboard page for managing some data migrations. hex.pm/packages/dat... #ElixirLang

Productive day today.

to commemorate alan dye moving from apple to meta, here's one of his best quotes

I just figured out how to execute LiveView.JS commands from a JavaScript hook! This is useful for manipulating the UI directly from your LiveView. For example, here I'm closing a modal after a `handle_event/3` callback succeeded. #ElixirLang

Got a few PRs in flight for Credo which cumulatively dropped the runtime from ~33 seconds down to ~9 on our 3500 file #ElixirLang codebase at work. 😁

News includes OTP 28.2 release, significant update to the "whois" library, Tidewave adds Figma support, KQL parser library, EEF vulnerability data on OSV-dev, and more! Plus: designing for failure vs handling errors. #ElixirLang www.youtube.com/watch?v=O-1z...

Software Mansion released v0.5.0 LiveDebugger. Looks like high quality release! - Calculate assigns size - Trace diffs sent to browser - Add dead LiveViews section - Add resources page - Add history of assigns - Async loading support - Add streams section #ElixirLang

Wow!

I may be the only one parsing WHOIS records in #ElixirLang, but the latest release of the library I maintain for this has big improvements for compatibility with a wider variety of domains. github.com/utkarshkukre...

Yoooooooo 🙌

🚨 ElixirConf EU 2026 CFP is OPEN! 40+ speaker slots. 300+ attendees. Europe's biggest Elixir event. We want your battle-tested knowledge on: Phoenix at scale Advanced LiveView patterns & more Built something ambitious with Elixir? Share it. Submit here: www.elixirconf.eu#cft

My offer still stands to match people’s donations. Send me a screenshot!

Just landed an ultra-rare +0/-0 PR. Yes, we merged this, yes it did something we cared about. Can you guess what it was?

I had a great time speaking at the first iteration of @exmexconf.bsky.social! The slides for my talk titled "Automating My Office" are up on my GitHub: github.com/axelson/talks #ExMexConf #elixirlang

Write code to make being human easier. Rip code out if it makes being human harder. Write code to make caring for each other easier. Rip it out if it makes caring for each other harder. Empathy driven development has literally never failed me. It’s done me better than everything else combined

Who do you know who wants to come work full time on #ElixirLang OSS tooling? (Boosts appreciated!) jump.ai/careers?ashb... #ElixirJobs

🚨 New Blog Post 🚨 I just finished this monster of a blog post! How to listen to database changes through the Postgres WAL! This is all @filipecabaco.com's fault who nerd-sniped me into low-level Postgres details! Click here to suffer too: peterullrich.com/listen-to-da... #ElixirLang #Postgres

Many such cases. Life gets so much better when you rip that Bandaid off.

#ElixirLang folks, I would *really* like my org's test suite to run with zero log messages printed unless there's a real error. How do you get to the Promised Land here?! Not all messages are deterministic, so if I fail CI due to logging, people get mad when it wasn't introduced by their change.

Hit off-by-1 errors in timing related tests when upgrading to Elixir 1.19. Turns out DateTime.diff changed subtly, it used to drop microseconds (everything rounded to seconds), now keeps them. Our tests relied on old behavior without realizing it. Hopefully saves ppl some debug time! 😅 #ElixirLang

How your email finds me

Hey so I’ve been looking for my next role and striking out. If you know anyone looking for an Elixir dev with experience managing and advocating for teams, I’m your guy!

Help, what's this new HexDocs UI?! :D

It’s easy to hate on this, but from the product side, it’s hard to prioritize letting somebody create a bunch of data in your app that they’ll never be able to retrieve again.

Send me a screenshot of your donation and I’ll match it. (Let’s cap it at $2,000 so my wife doesn’t murder me. 😆)

Realized this myself the other day and finally set up a recurring donation to harvesters.org. Do the same for your local food bank!

“Did you hear about this hot new startup? They’re on track to becoming a Garfield in the next couple years.”

Rare political post: Lots and lots and lots of people near you are about to be going hungry. Food banks need your donations like never before. www.politico.com/news/2025/10...

How do people handle required fields in LiveView? My instinct is to mark it `required` in the DOM and let the browser's native UI say "hey, you forgot this" when the person tries to submit the form. But going that route, there's no way to say "actually you forgot these 3 fields." #ElixirLang

Meet Elixir Language Tour – a tool created to make Elixir learning easier 🪄 Written in pure Elixir, running fully in the browser – all thanks to Popcorn 🍿 Check it out – link below!

I saw some TypeScript written with one function per file, and one directory per function+test file pair. WHO HURT YOU?! assets/ --> functions/ ----> build-url/ ------> build-url.ts ------> build-url.test.ts ----> download-file/ ------> download-file.ts ------> download-file.test.ts

Elixir 1.19 released! 🎉 This one had a lengthier rc period. It brings type system improvements and compile time improvements in large projects among other things 🚀 elixir-lang.org/blog/2025/10...

Sweet #Ecto datetime helpers? Yes, please! 😄 - ago, from_now, date_add, datetime_add 👨‍🍳🤌 #ElixirLang

For myself to more easily find again later. (GitHub Markdown "alerts") docs.github.com/en/get-start...

🚨 New Blog Post 🚨 EXTRA EXTRA! Hot off the press! The power of binary pattern matching revealed! The in-depth investigation you don't wanna miss! Get your copy now! #ElixirLang peterullrich.com/binary-patte...