In the wake of this week's article on SpacetimeDB's performance, and a few people have asked if you actually need 300,000 tx/second. So I wrote something explaining why that kind of scale is worth it even for smaller projects. It's all about speed, stress and money. spacetimedb.com/blog/okay-bu...

Ok, but does it need to scale? | Blog | Spacetime

It's fun to daydream about scale. Of building huge systems that can hit the front page of Hacker News or weather the storm of Black Friday sales without breaking a sweat. And we all enjoy benchmarks.…

spacetimedb.com

> fsync doesn’t save all your work to disk. If you modified the parent directory by creating a new file, you have to fsync the parent too daaam

Kris Jenkins@krisajenkins.bsky.social · 7d ago

I learnt something recently about fsync - how fsyncing a file isn't always enough to make sure your data is durable. And I felt like I should have known it already, so I wrote it up. 🙂 blog.jenkster.com/2026/09/fsyn...

I learnt something recently about fsync - how fsyncing a file isn't always enough to make sure your data is durable. And I felt like I should have known it already, so I wrote it up. 🙂 blog.jenkster.com/2026/09/fsyn...

What’s Next for DuckDB? 🦆 🤔 @hannes.muehleisen.org, co-creator of #DuckDB, was recently interviewed by @krisajenkins.bsky.social of the Developer Voices podcast on every challenge, reward, twist and turn of building a database as popular as DuckDB -- including a big acquisition. Watch or read:

What Next for DuckDB

DuckDB is an in-process SQL database management system focused on analytical query processing. It is designed to be easy to install and easy to use. DuckDB has no external dependencies. DuckDB has bin...

duckdb.org

A lot has happened since we last talked about DuckDB, the excellent local analytics database. They've added extensions, adopted a client-server model, competed with #ApacheIceberg, replaced their SQL parser and...been acquired. 😲 Get the full update: youtu.be/C3l4CsP1Ak0

What Happens When A Database Gets Popular? (with Hannes Mühleisen)

YouTube video by Developer Voices

youtu.be

I genuinely don’t understand how a management layer can be so shortsighted as to create an AI Usage Leaderboard, and then be surprised that token spend becomes a problem. I mean, I don’t expect middle managers to be Gary Kasparov, but looking half a step ahead would be nice. 🤦‍♀️

Is AI going to burn us all out? Or is it sweet liberation for those of us who got eaten up by management? And why is there such a gap between developer productivity and the actual impact we're seeing at work? Join James Brown and me to discuss the frontline impact of AI. youtu.be/JCPrxKse4YQ

The Enterprise AI Gap (with James Brown)

YouTube video by Developer Voices

youtu.be

I think 9/10 of my recent side-quests have been built either in Lua, or using SpacetimeDB, and all of my time's spent inside Neovim, so I whipped up a #Neovim plugin for browsing #SpacetimeDB instances. github.com/krisajenkins...

Workflow changes I've made in the past 12 months, and am very happy with: tmux → zellij vim → neovim git → jujutsu notion → obsidian Of those, #jujutsu is the biggest improvement. If you use `git rebase` or `git stash` regularly, you're probably the kind of person who would love it too.

There’s a fascinating algorithm called DBSP that single-handedly managed to combine streaming and batch systems and solve a decades-old database efficiency problem. Lalith Suresh joined me to explain the core of how it works: 😊 youtu.be/CyvnH8OUCUA

Making Materialized Views Actually Fast with DBSP (with Lalith Suresh)

YouTube video by Developer Voices

youtu.be

For some Friday afternoon fun, allow me to hijack your productivity with this game: Escape the Moon! It started as a side project to kick the tyres on #SpacetimeDB, but snowballed into a whole cards-and-crafting web game. Hope you enjoy. Let me know if you do. 🙂 escapethemoon.vercel.app

Escape the Moon

Crash-land, gather, refine and fabricate your way off a dead moon. The only way off this rock is the one you build.

escapethemoon.vercel.app

I am worried about Vibe Coding, but there's something that worries me far more: Vibe Management. blog.jenkster.com/2026/06/vibe...

I'm making a game. It's about escaping a crash landing on the moon, but right now it looks like it's about parenting. 😅

At the @spacetimedb.bsky.social hackathon last weekend someone built a system for monitoring CCTV camera networks. I was one of the judges, so I looked at their entry. Which means I can finally answer the age-old question, "Who watches the watchmen?" Me. It was me all along. 😁

I'm on my way to New York Tech Week to be a guest judge at the #SpacetimeDB Hackathon. Now if I'm a judge, I obviously can't enter. But I also wouldn't be able to go to a hackathon and not build *anything*, so I am currently on a plane devising a very detailed spec document to hand to the robots. 😅

I've been interested in Elm since I heard about it from @krisajenkins.bsky.social although I'm more curious about Gleam. I'm mostly into Svelte and I don’t really see a reason to explore other things right now but I hope I can find some time to build something with them for fun

@fun-ctional.bsky.social · 4mo ago

Discover why Elm shines in a world of React, Vue, and Svelte https://cekrem.github.io/posts/why-i-hope-i-get-to-write-a-lot-of-elm-code-in-2025/

Why does Workday have an "Add to Favourites" feature for expense items? Who has a "favourite" expense? 🫠 Ah, that $2.99 I spent on paperclips back in 2023 - those were good times. ❤️

The most interesting idea buzzing around my head right now is using structured languages to guide AI Agents’ reasoning, and it’s just one of the many exciting and nuanced ideas I got from talking with Henry Garner as we discuss his what’s-hot-what’s-not AI Radar. youtu.be/43lsrgkhJ8c

What's Worth Knowing In AI Right Now? (with Henry Garner)

YouTube video by Developer Voices

youtu.be

Prediction for 2026: We'll start to see the introduction of `cmd --skill`, which will be purely informational (like `cmd --help`) but will emit an up-to-date SKILL.md file for using the tool.

When you’re a humble salmon on a pilgrimage to visit the sky goats and the mescaline kicks in.

Asciinema is a fantastic tool for anything from terminal demos to full ASCII movies. 😁 This week Marcin Kulik talks about a project 14 years and 5+ languages in the making. We dig into terminal rendering, parsing quirks, and how a passion project can take on a life of its own. youtu.be/sHwWNFAjAxo

Asciinema: Terminal Recording Done Right (with Marcin Kulik)

YouTube video by Developer Voices

youtu.be

How do you connect the dots between a game engine, a database, a streaming system and an OS? Tyler C. joins me this week to explain how they're all connected, and to share some battle scars from trying to launch a Database (SpacetimeDB) and an MMO (BitCraft) at the same time. 😅 youtu.be/A9A8pptfz0Q

SpacetimeDB: What launching an MMO can teach us about Databases (with Tyler Cloutier)

YouTube video by Developer Voices

youtu.be

I’m not saying we can (or should) run LLMs on our phones, but text autocomplete is looking really bad these days. Like if I type in my first name, it doesn’t even guess that my surname might be coming. Even a Markov Chain could get that one.

I've been tinkering with a #jujutsu plugin for #neovim. If those two hashtags meant something to you, you've self-selected! Give it a whirl and let me know what you think. 🙂 github.com/krisajenkins...

When you press "Beautify This Slide" on Google Slides.

This is such a great idea - a simple tool for local code reviews. More and more I find myself reviewing code that was written by an LLM, and wishing I could comment on individual lines as I go the way I would with a github code review. This nails it. 🏆 github.com/agavra/tuicr

GitHub - agavra/tuicr: Review AI-generated diffs like a GitHub pull request, right from your terminal.

Review AI-generated diffs like a GitHub pull request, right from your terminal. - agavra/tuicr

github.com

I do not want to see your kid's crayon drawings and I do not want to see your AI-generated clipart.

Terminal tip(s) of the day: `bat` is a great alternative to `cat` that adds syntax highlighting. And if you’re reading markdown specifically, `glow` is even better.

I've been trying out OpenCode with Ollama. I'm not expecting it to be as good as Claude, just that it will be available when I don't have internet access. But...fast, local and free is pretty compelling. You have to wonder how long Anthropic can maintain an edge that's worth their $100/month. 🤔

`jujutsu fix` is just so good. It automatically rewrites your commits as though you'd remembered to run the code formatter each time.