Jon Gjengset

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Jon Gjengset

Jon Gjengset

@jonhoo

Rust live-coder and OSS tinkerer who loves teaching. I try to keep a high SNR. Wrote Rust for Rustaceans. At @HelsingAI. Ex AWS. Co-founded @readysetio. he/him

Oslo, Norway Katılım Mart 2009
189 Takip Edilen36K Takipçiler
Sabitlenmiş Tweet
Jon Gjengset
Jon Gjengset@jonhoo·
As the year is about to close, it's about time to say good-bye to Twitter. I'm not deleting the account or old tweets, I'll still monitor for mentions and DMs, and if something has _only_ been posted to Twitter I may retweet here. But all announcements will go elsewhere.
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Anish Athalye
Anish Athalye@anishathalye·
In January, @jonhoo, @jjgort, and I returned to @MIT_CSAIL to teach Missing Semester, a class on topics missing from most CS programs—tools and techniques that everyone should know, like Bash, Git, CI/CD, and AI tools. Today, we’re releasing the course for free online!
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Jon Gjengset
Jon Gjengset@jonhoo·
@GergelyOrosz I've played around with calling it "power coding". In many ways it feels similar to powertools in construction — speeds up work, not appropriate for all tasks, and dangerous if used carelessly.
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Gergely Orosz
Gergely Orosz@GergelyOrosz·
We should stop calling it “vibe coding” when it’s software engineers writing production software, paying close attention, thinking a lot, validating before committing, closing the loop… and yes they prompt an agent/work with it. Very different from “let it rip” w 0 validation
Deedy@deedydas

Today was proof that fully polished new products can be built entirely with “vibe coding” tools like Claude Code. Many people, espp in BigTech, who still don’t believe it: – you haven’t tried the latest models – you don’t have the right setup – codebase is still too large – your code style is not well-represented in the training data All 4 of these are entirely self-imposed problems. You will be outrun on product velocity if you aren’t adopting these tools.

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Jon Gjengset
Jon Gjengset@jonhoo·
@simonw But I will add that liberal use of YouTube chapters in the video is pretty helpful, because it means that _if_ you spend half an hour digging yourself out of a (fascinating) hole, those with less time to spare can skip over it easily.
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Jon Gjengset
Jon Gjengset@jonhoo·
@simonw As someone who does the live coding approach exclusively, I've gotten repeated feedback that people really enjoy watching me get stuck and then learning from the process I use to get un-stuck. That's the stuff that tends to get lost in the "here's one I made earlier" version.
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Simon Willison
Simon Willison@simonw·
YouTube question: I've been making a few videos recently and I'm torn between the honest no-cheating live coding approach and the here's-something-I-prepared-earlier approach I'm aiming for 10-30 minutes per video Which format do people find more useful?
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Jon Gjengset
Jon Gjengset@jonhoo·
@hochej @mitsuhiko I don't think I'm skeptical enough for what Armin is looking for here. Though would always be happy to chat to him :p Have spent the past week since my stream immersing myself in using Claude Code, and definitely have a deeper (but not all that *changed*) perception now.
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Joscha Hoche
Joscha Hoche@hochej·
@mitsuhiko @jonhoo It would be so cool if you could make a video/stream together. I really enjoyed the Sguaba vibe coding stream as well as Armin's latest videos on AI coding.
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Armin Ronacher ⇌
Armin Ronacher ⇌@mitsuhiko·
I want to record a video with me and another programmer who is not getting value out of AI. Goal is to have a good discussion about our approaches and learnings. Anyone interested?
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Anish Athalye
Anish Athalye@anishathalye·
Missing Semester has grown past 100K subscribers on YouTube. Appreciate all the engagement and support! We plan to teach another iteration of the course in January 2026, revising the curriculum and covering new topics like AI IDEs and vibe coding.
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James Cowling
James Cowling@jamesacowling·
How to be a Principal Engineer/Senior Principal Engineer/Senior Architect/fancy-sounding-title Engineer, a thread: 1. You're evaluated on how much more the company succeeds because you're there, not the lines of code you wrote. If you can unblock someone, do that. If you need to kill a two year project that's not going anywhere, do that. Do what is right, not what makes you look good.
Igor Kolomiets@ikolomiets

@jamesacowling @eatonphil Very interesting. Do you have more insights into senior principal engineer role for somebody who considers it as a next milestone on their carrier path?

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Jon Gjengset
Jon Gjengset@jonhoo·
As for where "elsewhere" is, they're all listed on jonhoo.eu, and at the time of writing includes YouTube, Discord, LinkedIn, Bluesky, and Mastodon. See you all there!
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Jon Gjengset
Jon Gjengset@jonhoo·
As the year is about to close, it's about time to say good-bye to Twitter. I'm not deleting the account or old tweets, I'll still monitor for mentions and DMs, and if something has _only_ been posted to Twitter I may retweet here. But all announcements will go elsewhere.
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Jon Gjengset
Jon Gjengset@jonhoo·
Perhaps unsurprisingly, I have a bunch of Opinions™ on work-life balance and time management. Lately, I've been particularly bugged by the common belief that employer incentives don't align with employee well-being. So, I wrote a thing (with graphs!): thesquareplanet.com/blog/about-40-…
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Jon Gjengset
Jon Gjengset@jonhoo·
@burntsushi5 In my case someone apparently "gifted" (or so a random notification that then disappeared said). Maybe the same happened to you?
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Andrew Gallant
Andrew Gallant@burntsushi5·
I somehow have a blue checkmark despite never giving a cent to Twitter or requesting verification.
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Smarter Every Day
Smarter Every Day@smartereveryday·
Hey it's me Destin, from Smarter Every Day. Now that it's time to elect America's next leader, I would like to share something very interesting and important with you. I've been paying attention to this for a while, and I think if you look for it, you see it too. 🧵 1/n
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EuroRust
EuroRust@euro_rust·
🎥 The first #eurorust24 video is here! Starting off strong with @jonhoo , the Principal Engineer at @HelsingAI , as he teaches fundamental concepts of Rust that can be challenging for newcomers. It’s a masterclass in effective Rust education! Btw, Jon 🦀 is also the author of Rust for Rustaceans and the creator of the Crust of Rust YouTube series 📺 buff.ly/4f44nED Go and check out his other works! Watch Jon's video here ➡️ buff.ly/3NO9DAf #rustlang #techeducation #crustofrust
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EuroRust
EuroRust@euro_rust·
🎉 New and FREE at #eurorust24: Competitive Control Systems Hackathon by Helsing! Build a control system in Rust for a virtual quadcopter, compete live on a leaderboard, and test your creativity. Limited seats—grab yours now! Mentors: Dr. Robert Fink, @jonhoo , Cécile Allano , Omar Essaid 🔗 eurorust.eu/workshops/hack… #rustlang
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Jon Gjengset
Jon Gjengset@jonhoo·
Recording of today's stream where we decrusted the quickcheck property testing crate is now up! youtu.be/64t-gPC33cc
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YouTube
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Jon Gjengset
Jon Gjengset@jonhoo·
Time in your timezone:
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Keşfet

@jjgort @MIT_CSAIL @GergelyOrosz @simonw @NotNordgaren @theodorvaryag @LundukeJournal @nostarch