Jan
@jflessau.bsky.social
Software dev for health care products by day, side project hoarder by night.
🦀 rust | 🎾 padel | 🎲 dnd | 🖨️ 3d printing
📍 Hamburg, Germany
Website: https://jflessau.com
GitHub: https://github.com/jflessau
Mastodon: https://hachyderm.io/@jflessau
🦀 rust | 🎾 padel | 🎲 dnd | 🖨️ 3d printing
📍 Hamburg, Germany
Website: https://jflessau.com
GitHub: https://github.com/jflessau
Mastodon: https://hachyderm.io/@jflessau
Wrote a CLI for formatting SQL within sqlx macros like query_as!
It includes a GitHub CI Action for format checks and uses the sqruff formatter under the hood.
github.com/jflessau/sql...
#rust #sql #postgres #ci #github
It includes a GitHub CI Action for format checks and uses the sqruff formatter under the hood.
github.com/jflessau/sql...
#rust #sql #postgres #ci #github
GitHub - jflessau/sqlx-fmt: Format SQL in sqlx macros with sqruff.
Format SQL in sqlx macros with sqruff. Contribute to jflessau/sqlx-fmt development by creating an account on GitHub.
github.com
November 6, 2025 at 8:04 PM
Switched from cargo test to nextest and its output is much nicer. It's also a few seconds faster on a 2-3 minute set of integration tests.
nexte.st
#rust #tdd
nexte.st
#rust #tdd
cargo-nextest
A next-generation test runner for Rust.
nexte.st
November 1, 2025 at 9:12 AM
Just wrote a pice about that time I built a bot to win giveaways on twitter, circa 2015. (It actually worked)
#dev #python #bot #blog
jflessau.com/projects/ret...
#dev #python #bot #blog
jflessau.com/projects/ret...
Retweet 2 Win
A Twitter Bot for winning giveaways automatically and how it led to wins and regrets.
jflessau.com
October 27, 2025 at 5:35 AM
Just wrote a pice about that time I built a bot to win giveaways on twitter, circa 2015. (It actually worked)
#dev #python #bot #blog
jflessau.com/projects/ret...
#dev #python #bot #blog
jflessau.com/projects/ret...
Reposted by Jan
GPUI (v0.2.0), the GPU-accelerated Rust UI framework that powers Zed, is on crates dot io. 👀
crates.io/crates/gpui
crates.io/crates/gpui
October 9, 2025 at 3:29 PM
GPUI (v0.2.0), the GPU-accelerated Rust UI framework that powers Zed, is on crates dot io. 👀
crates.io/crates/gpui
crates.io/crates/gpui
Made the switch from #hugo to #zola as the static site generator for my personal #blog:
jflessau.com
It doesn’t really matter much to readers, but I needed a justification to spend a few hours on a new design.
jflessau.com
It doesn’t really matter much to readers, but I needed a justification to spend a few hours on a new design.
October 4, 2025 at 10:23 PM
Made the switch from #hugo to #zola as the static site generator for my personal #blog:
jflessau.com
It doesn’t really matter much to readers, but I needed a justification to spend a few hours on a new design.
jflessau.com
It doesn’t really matter much to readers, but I needed a justification to spend a few hours on a new design.
Wrote a piece on coding with AI.
Bottom line: Autocomplete is fine; agentic editing is overhyped, at least for now.
Autocomplete lets you code at the speed of thought, while agentic editing breaks that speed limit, and you have to catch up mentally anyway.
#ai #blog
jflessau.com/dev/ai-coding/
Bottom line: Autocomplete is fine; agentic editing is overhyped, at least for now.
Autocomplete lets you code at the speed of thought, while agentic editing breaks that speed limit, and you have to catch up mentally anyway.
#ai #blog
jflessau.com/dev/ai-coding/
Jan's Blog
My thoughts about coding with AI
jflessau.com
August 27, 2025 at 9:39 AM
Wrote a piece on coding with AI.
Bottom line: Autocomplete is fine; agentic editing is overhyped, at least for now.
Autocomplete lets you code at the speed of thought, while agentic editing breaks that speed limit, and you have to catch up mentally anyway.
#ai #blog
jflessau.com/dev/ai-coding/
Bottom line: Autocomplete is fine; agentic editing is overhyped, at least for now.
Autocomplete lets you code at the speed of thought, while agentic editing breaks that speed limit, and you have to catch up mentally anyway.
#ai #blog
jflessau.com/dev/ai-coding/
August 16, 2025 at 10:58 PM
Rooting for this little fella to escape from my monitor before dying. Any tips?
July 21, 2025 at 1:37 PM
Rooting for this little fella to escape from my monitor before dying. Any tips?
Reposted by Jan
That was surprisingly hard, but here we go. Kubernetes on the Apple Watch!
May 30, 2025 at 8:18 AM
That was surprisingly hard, but here we go. Kubernetes on the Apple Watch!
A few months ago, my application with the Fuel Registry of the German Federal Cartel Office was approved. With access to the gasoline and diesel prices they provide for all of Germany, I'm now building a small web app.
#webdev #CivicTech #buildinpublic
#webdev #CivicTech #buildinpublic
May 24, 2025 at 8:32 AM
A few months ago, my application with the Fuel Registry of the German Federal Cartel Office was approved. With access to the gasoline and diesel prices they provide for all of Germany, I'm now building a small web app.
#webdev #CivicTech #buildinpublic
#webdev #CivicTech #buildinpublic
A 3D printable frame for an e-ink display and a public website to control its content.
I'll let the internet decide what I see next.
What could go wrong?
Control the frame here: inkday.jflessau.com
Or set up your own: github.com/jflessau/ink...
#3dprint #diy #webdev
I'll let the internet decide what I see next.
What could go wrong?
Control the frame here: inkday.jflessau.com
Or set up your own: github.com/jflessau/ink...
#3dprint #diy #webdev
May 17, 2025 at 4:31 PM
A 3D printable frame for an e-ink display and a public website to control its content.
I'll let the internet decide what I see next.
What could go wrong?
Control the frame here: inkday.jflessau.com
Or set up your own: github.com/jflessau/ink...
#3dprint #diy #webdev
I'll let the internet decide what I see next.
What could go wrong?
Control the frame here: inkday.jflessau.com
Or set up your own: github.com/jflessau/ink...
#3dprint #diy #webdev
Google: Material 3 Expressive is the most researched update to Google’s design system, ever.
HN:
HN:
May 16, 2025 at 3:48 PM
Google: Material 3 Expressive is the most researched update to Google’s design system, ever.
HN:
HN:
Trying out agentic editing in the #Zed editor. It's mesmerizing to watch it create and edit files 🌀
Building a PWA to track expenses collaboratively. For this little side project, it's working surprisingly well.
#webdev #solidjs #buildinpublic
Building a PWA to track expenses collaboratively. For this little side project, it's working surprisingly well.
#webdev #solidjs #buildinpublic
May 12, 2025 at 12:13 PM
Trying out agentic editing in the #Zed editor. It's mesmerizing to watch it create and edit files 🌀
Building a PWA to track expenses collaboratively. For this little side project, it's working surprisingly well.
#webdev #solidjs #buildinpublic
Building a PWA to track expenses collaboratively. For this little side project, it's working surprisingly well.
#webdev #solidjs #buildinpublic
Made this 3D printable base for #dnd minis that projects a field of view cone with an adjustable angle.
STL files and some more pictures are available here:
jflessau.com/projects/bea...
#3dprint #3d #rpg
STL files and some more pictures are available here:
jflessau.com/projects/bea...
#3dprint #3d #rpg
May 7, 2025 at 9:32 PM
Made this 3D printable base for #dnd minis that projects a field of view cone with an adjustable angle.
STL files and some more pictures are available here:
jflessau.com/projects/bea...
#3dprint #3d #rpg
STL files and some more pictures are available here:
jflessau.com/projects/bea...
#3dprint #3d #rpg
Built a thing that creates 1-2 minute audio digests from hashtag posts. What do you think?
#buildinpublic
Includes posts from:
jkemppainen.com - vehicle combat game
monfang.bsky.social - outreach strategy
chromatic-ai.bsky.social - PRAY app revenue
indieceo.bsky.social - open-source licensing
#buildinpublic
Includes posts from:
jkemppainen.com - vehicle combat game
monfang.bsky.social - outreach strategy
chromatic-ai.bsky.social - PRAY app revenue
indieceo.bsky.social - open-source licensing
March 13, 2025 at 9:08 PM
Built a thing that creates 1-2 minute audio digests from hashtag posts. What do you think?
#buildinpublic
Includes posts from:
jkemppainen.com - vehicle combat game
monfang.bsky.social - outreach strategy
chromatic-ai.bsky.social - PRAY app revenue
indieceo.bsky.social - open-source licensing
#buildinpublic
Includes posts from:
jkemppainen.com - vehicle combat game
monfang.bsky.social - outreach strategy
chromatic-ai.bsky.social - PRAY app revenue
indieceo.bsky.social - open-source licensing
Tried a drag-and-drop workflow tool and built an #automation that grabs the top X #HackerNews stories with their top Y comments. It uses AI to summarize and convert them into a 1-3 minute audio digest sent to my inbox twice a day. Loving it!
March 9, 2025 at 10:25 PM
Tried a drag-and-drop workflow tool and built an #automation that grabs the top X #HackerNews stories with their top Y comments. It uses AI to summarize and convert them into a 1-3 minute audio digest sent to my inbox twice a day. Loving it!
Just rediscovered my Pixabay account and saw that my vector graphics have been downloaded 5 million times! 🎉
Reverse image search showed that they're all over the internet. Made my day! :)
Reverse image search showed that they're all over the internet. Made my day! :)
March 7, 2025 at 8:18 AM
Just rediscovered my Pixabay account and saw that my vector graphics have been downloaded 5 million times! 🎉
Reverse image search showed that they're all over the internet. Made my day! :)
Reverse image search showed that they're all over the internet. Made my day! :)
Wanted a #postgres fan shirt, so I made this using #ai and #affinityphoto.
Printed shirt will arrive in a few days.
Printed shirt will arrive in a few days.
February 18, 2025 at 10:15 PM
Wanted a #postgres fan shirt, so I made this using #ai and #affinityphoto.
Printed shirt will arrive in a few days.
Printed shirt will arrive in a few days.
My take on a habit tracker web app:
- 👤 No login required
- 🔌 Works offline
- 📁 Import & export data
- 📄 MIT licensed
Built with #rust and #leptos.
Demo: ritmo.jflessau.com
Repo: github.com/jflessau/ritmo
#webdev #buildInpublic #rustlang
- 👤 No login required
- 🔌 Works offline
- 📁 Import & export data
- 📄 MIT licensed
Built with #rust and #leptos.
Demo: ritmo.jflessau.com
Repo: github.com/jflessau/ritmo
#webdev #buildInpublic #rustlang
February 15, 2025 at 6:09 PM
My take on a habit tracker web app:
- 👤 No login required
- 🔌 Works offline
- 📁 Import & export data
- 📄 MIT licensed
Built with #rust and #leptos.
Demo: ritmo.jflessau.com
Repo: github.com/jflessau/ritmo
#webdev #buildInpublic #rustlang
- 👤 No login required
- 🔌 Works offline
- 📁 Import & export data
- 📄 MIT licensed
Built with #rust and #leptos.
Demo: ritmo.jflessau.com
Repo: github.com/jflessau/ritmo
#webdev #buildInpublic #rustlang
Reposted by Jan
Hardly new info, but BSky should know:
Warsaw's water quality is monitored by eight clams with magnets attached to their shells. If contamination in the water causes the clams to close, the magnets trigger an alarm and shut off the city's water supply.
Thank you, little guardian molluscs.
🧪🌏🚰
Warsaw's water quality is monitored by eight clams with magnets attached to their shells. If contamination in the water causes the clams to close, the magnets trigger an alarm and shut off the city's water supply.
Thank you, little guardian molluscs.
🧪🌏🚰
February 7, 2025 at 12:39 PM
Hardly new info, but BSky should know:
Warsaw's water quality is monitored by eight clams with magnets attached to their shells. If contamination in the water causes the clams to close, the magnets trigger an alarm and shut off the city's water supply.
Thank you, little guardian molluscs.
🧪🌏🚰
Warsaw's water quality is monitored by eight clams with magnets attached to their shells. If contamination in the water causes the clams to close, the magnets trigger an alarm and shut off the city's water supply.
Thank you, little guardian molluscs.
🧪🌏🚰
Where are you renting cheap GPU instances for a few hours or days?
I tried:
Paperspace: Borderline unusable since Digital Ocean bought it.
Lambda: Cool, but the availability of cheap instances is volatile.
RunPod: My current go-to. Prices are okay, as is availability.
How about you?
#ml #ai
I tried:
Paperspace: Borderline unusable since Digital Ocean bought it.
Lambda: Cool, but the availability of cheap instances is volatile.
RunPod: My current go-to. Prices are okay, as is availability.
How about you?
#ml #ai
February 1, 2025 at 10:30 PM