Andrea Leopardi
@whatyouhi.de
Member of the Elixir core team, speaker, writer. he/him. Platform Engineer at Knock.
Just published a blog post about how we (at Knock) use @clickhouse.com to periodically dump info about our most resource-intensive BEAM processes. Already 100s of millions of rows, sub-10ms queries. andrealeopardi.com/posts/beam-m...
BEAM Metrics in ClickHouse
How we are periodically dumping metrics about our most demanding BEAM processes into an easy-to-query ClickHouse table.
andrealeopardi.com
I just released a lil @elixir-lang.org library for generating docs about telemetry events from structured data. Love me some telemetry events but they're often an underdocumented aspect of libraries. hex.pm/packages/tel... Feedback welcome 👐
telemetry_docs
Generates Markdown documentation from structured telemetry event definitions.
hex.pm
I somewhat got used to OpenClaw. Not the tool per se: mostly having an LLM I can talk to that lots more context on me than Claude or ChatGPT. That context comes from integrations I was easily able to build in the form of little CLIs or APIs that get data from my trainings, [1/3]
I'll be there. 2026 is the year I push for conferences. Submit!! If you are unsure, submit even harder. Let's get some new folks in! ☺️
Code BEAM@codebeam.bsky.social · 8mo agoCFT extended 1 week! Committee reviews THIS WEEK - submit now for first-round consideration: codebeamvancouver.com#cft
This is what I've been working on for the past ~6 months. It's been awesome. So much technical writing to do out of this 😁 Of course, all @elixir-lang.org. knock.app/changelog/20...
Dynamic audiences beta | Changelog 2025-12-11 | Knock
Build dynamic audiences that update in real-time on top of your Knock user data.
knock.app
I've been super quiet on socials (because everything is a screaming burning hell for everyone amirite) but I'll try to post a bit more. What better excuse than the first 1.0 release of Gettext for @elixir-lang.org, which is 10+ years old?! Fresh of an Hex near you??? hex.pm/packages/get...
gettext
Internationalization and localization through gettext
hex.pm
I wrote about something very close to my heart: how to make ALL the tests async in @elixir-lang.org. Enjoy! 🏎️ andrealeopardi.com/posts/async-...
How to Async Tests in Elixir
It can be hard to keep tests asynchronous as Elixir applications grow in size and complexity. Let's see why, and explore fixes.
andrealeopardi.com
#elixir community! I’m trying to write a blog post and need some sources/data. Could you please run "mix test" on one or more of your @elixir-lang.org codebases and report results? I’m looking for: 1. # of tests 2. # of async tests 3. Total time sync 4. Total time async
How do you avoid the trap of having to allow notifs from an app (Uber for example) and then the app spams you with shit non-relevant notifications about promotions and other stuff?
AlchemyConf is over. Fantastic conference, I can't recommend it enough. The organization did an outstanding job!! Here are the slides from my closing talk: speakerdeck.com/whatyouhide/... Thanks everyone 🫎
gen_statem - OTP's Unsung Hero
Given at AlchemyConf 2025 in Braga, Portugal.
speakerdeck.com
Alchemy Conf@alchemyconf.com · last yr.One last huge thank you to @whatyouhi.de and Aaron Cruz for the final two talks of the conference. We will not forget these last few days. Alchemists, stay tuned, because we'll have some goodies for you in the next few days. #ElixirLang #MyElixirStatus
Yo, if you come to @alchemyconf.bsky.social, code ANDREALEOPARDI gets you 10% off the ticket 🇵🇹
I played around with an @obsidian.md theme for my own usage, I might open it up if I get to polish it enough 🙃
Super nice post about @elixir-lang.org's nimble_ownership library by Alex Martsinovich: distantprovince.by/posts/what-d... Great stuff to know about. Also, great technical writing 👏
What Does NimbleOwnership Do Anyway? | Alex Martsinovich
NimbleOwnership may not take bribes, but it certainly knows who your father is.
distantprovince.by
For today, you get get this 50% off with code "alnpee2024" (cause @pragprog.com are nice!)
Andrea Leopardi@whatyouhi.de · 2y agoNew beta release of "Network Programming in @elixir-lang.org and #Erlang" is out: pragprog.com/titles/alnpe... HTTP/1.1 chapter's in there. HTTP/2 (+3) chapter is already in review, and WebSockets chapter is in progress... and then we Ship It™ 🛳️
New beta release of "Network Programming in @elixir-lang.org and #Erlang" is out: pragprog.com/titles/alnpe... HTTP/1.1 chapter's in there. HTTP/2 (+3) chapter is already in review, and WebSockets chapter is in progress... and then we Ship It™ 🛳️
Network Programming in Elixir and Erlang
Learn network programming with Erlang and Elixir. Build reliable and scalable network systems, and understand why this platform is a perfect fit for networks.
pragprog.com
Tomorrow I srart as a platform engineer at Knock. Excited? Yeah, but it's sort of like coming home? I know I will have the BEST time there... I think we were all meant to be. 🥰
What interesting stuff are folks reading? Now I’m reading "Build a Large Laguage Model (from Scratch)"
I've been wearing this lil fucker for the past few months. I appreciate beautiful watches but man. No charging, no notifications. I wouldn't be able to break it if I tried. Looks kick ass like I’m an 80s cool kid or something. The hell
Interesting read by @mitsuhiko.at. I think this applies to lots of use cases. It does make software harder in some way IMO, but "hard software" is generally easier to solve than "software that needs to be used for a long time". Thoughts? lucumr.pocoo.org/2024/10/30/m...
Make It Ephemeral: Software Should Decay and Lose Data
Make software that is capable to forget and decay information.
lucumr.pocoo.org
Spent the last few days in Hanoi, Vietnam 🇻🇳 Wow. Westerner perspective, apologize the possible stereotypical shots and whatnot.
Living in non-English speaking countries makes buying books like this a nightmare 🥲 In Italy at least, I don't really know of alternatives to the mogul
Lady Haha@lensman23.bsky.social · 2y agoBookstores make more than a third of their money between now & New Year. Amazon doesn't need your business, bookstores do.
I’m a nerd for apps and setups and whatnot. Here's my "travel" focus I use on trips. Love it.
If you wanna pick up the beta of Network Programming in Elixir and Erlang it'd be a good time too. We're essentially only one chapter away from printtttttt
The Pragmatic Bookshelf ✅@pragprog.com · 2y agoPragmatic Black Friday Sale Including these great Elixir / BEAM titles (along with everything else we publish!) Use checkout code turkeysale2024 for 40%!
Pairing. So fascinating. So it's called "pair programming" but I've recently experienced folks who *mandate* pair programming on employees—8h/day. Do you think pairing is helpful for anything other than programming? Learning, technical writing, whathaveya
I used to feel quite strongly on AI (in a bad way) but I think I’m turning around. I’m getting a lot of help when learning stuff by chatting through it with an LLM for example. The environmental concerns are still there though, especially when it comes to training the models.
I think Apple's software offering is good these days—Reminders, Notes, and cal especially. Wish they made things more open for interop though. Say, being able to get Reminders into Obsidian without a fragile AppleScript spell and stuff like that.
I think I’m writing this book just so that I can do silly little drawings.
I’m almost done with the HTTP/1 chapter of pragprog.com/titles/alnpe..., so many shoutouts in there!! 🍥
Network Programming in Elixir and Erlang
Learn network programming with Erlang and Elixir. Build reliable and scalable network systems, and understand why this platform is a perfect fit for networks.
pragprog.com
