I 💜 this passage from @jkwa.bsky.social buff.ly/xIVq6gW

"... understanding doesn’t parallelize, and complexity doesn’t distribute. Each new contributor must climb the same tangled mess... even more time is spent coordinating, clarifying, and patching over mismatches in mental models."

#elixirlang

I just finished putting together interactive Livebook notebooks for every chapter of Advanced Functional Programming with Elixir.

You can now run all the examples in your browser. Or like me, spin them up locally with Docker:

www.joekoski.com/blog/2025/09...

#elixirlang hashtag#AFPElixir

The Groxio team—Bruce Tate, Paulo Valim, and myself—are fresh off of a project where we helped scale an application and its development team all the way to launch. If your company could use #ElixirLang #Consulting help from one or more of us, let’s talk! groxio.com

Explanation:

Prior to #ElixirLang 1.19, it was deemed sufficient to compile deps one at a time (compile Phoenix, then LiveView, then Postgrex, then Ecto, etc.), because each individual compilation would be parallelized across all cores.

However... 🧵

My #ElixirConf 2025 talk, “Cat and Mouse: Challenges in Adversarial Web Scraping” is now online! Here’s everything I know about scraping and avoiding being scraped.

youtu.be/8mumTeuiZ6o?...

#ElixirLang

Bot detection goes way beyond user agents
TLS handshake to JavaScript execution tracking
@tylerayoung.com‬ explores the cat-and-mouse game of web scraping vs bot detection. #ElixirConfUS

Web scraping issues presented from the perspectives of both the scraper and the server operator by @tylerayoung.com at @elixirconf.bsky.social

And that's a wrap! That was a really inspiring @elixirconf.bsky.social during the most disruptive time in our industry.

Thank you to everyone who discussed the talk with me afterwards. It's really helpful and rewarding to know what the audience learned. See you in Chicago!

#elixirconf #elixir

Really enjoyed @nicholasjhenry.github.io’s talk on validating business rules in Ecto. It had never occurred to me that we should validate some of our association rules in the context, not the schema’s changeset function, but I’m convinced!

I'll be presenting at @elixirconf.bsky.social next week on how to apply Business Rule Thinking with Ecto. If you want to learn how to discover and implement business rules in rich domains, this might be a talk for you.

elixirconf.com/talks/mise-e...

See you there!
#ElixirLang
#ElixirConf

My #elixirconf 2024 talk has been published!

"Beyond Mocks: Messing with Our Preconceptions of Testing"

I discuss the challenges of using test mocks and how they can lead to unreliable tests. I introduce the Nullable pattern from James Shore applied to testing with external dependencies in Elixir.

A new blog post from the field; week 27 Jan 2025