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
My #cyberdeck build is almost done.
#3dprint is complete, parts are assembled but not painted yet.
Still working on the #rust TUI application that runs on the main screen.
#freeCAD
#3dprint is complete, parts are assembled but not painted yet.
Still working on the #rust TUI application that runs on the main screen.
#freeCAD
January 31, 2026 at 4:52 PM
My #cyberdeck build is almost done.
#3dprint is complete, parts are assembled but not painted yet.
Still working on the #rust TUI application that runs on the main screen.
#freeCAD
#3dprint is complete, parts are assembled but not painted yet.
Still working on the #rust TUI application that runs on the main screen.
#freeCAD
I made a website to control the content on my retro cube.
If you’d like, send me a message :)
retro-cube.jflessau.com/form
user: retro
password: cube
#3dprinting #pi #rust
If you’d like, send me a message :)
retro-cube.jflessau.com/form
user: retro
password: cube
#3dprinting #pi #rust
January 26, 2026 at 9:14 AM
I made a website to control the content on my retro cube.
If you’d like, send me a message :)
retro-cube.jflessau.com/form
user: retro
password: cube
#3dprinting #pi #rust
If you’d like, send me a message :)
retro-cube.jflessau.com/form
user: retro
password: cube
#3dprinting #pi #rust
I made a housing for a #pi zero, an #OLED, and a dial for navigating between the views:
- Date & Time
- Weather
- A message fetched from a server
The server hosts a web form to update the message.
I think the colors turned out pretty cool :)
All written in #Rust and designed with #FreeCAD.
- Date & Time
- Weather
- A message fetched from a server
The server hosts a web form to update the message.
I think the colors turned out pretty cool :)
All written in #Rust and designed with #FreeCAD.
January 21, 2026 at 8:39 PM
Switched from #blender to #FreeCAD for my #cyberdeck build and finally gathered all the hardware parts. #3dprinting it tomorrow! Still not sure how I’ll paint it, though.
January 18, 2026 at 8:50 PM
Switched from #blender to #FreeCAD for my #cyberdeck build and finally gathered all the hardware parts. #3dprinting it tomorrow! Still not sure how I’ll paint it, though.
A small part of me wishes people who start hitting the gym in January would give up sooner. This year most stayed until March and it was so crowded.
December 30, 2025 at 4:36 PM
A small part of me wishes people who start hitting the gym in January would give up sooner. This year most stayed until March and it was so crowded.
Had some fun with fuel price data from the german cartel office and wrote about it.
Teaser: Very synchronized prices of two gas stations, different companies, 5 km apart, no clear line of sight.
[one frame = one station]
#data #datascience #blog #opendata
jflessau.com/projects/gas...
Teaser: Very synchronized prices of two gas stations, different companies, 5 km apart, no clear line of sight.
[one frame = one station]
#data #datascience #blog #opendata
jflessau.com/projects/gas...
December 23, 2025 at 4:23 PM
Had some fun with fuel price data from the german cartel office and wrote about it.
Teaser: Very synchronized prices of two gas stations, different companies, 5 km apart, no clear line of sight.
[one frame = one station]
#data #datascience #blog #opendata
jflessau.com/projects/gas...
Teaser: Very synchronized prices of two gas stations, different companies, 5 km apart, no clear line of sight.
[one frame = one station]
#data #datascience #blog #opendata
jflessau.com/projects/gas...
A friend and I built mcsprit.de, a website to see real-time gasoline prices in Germany.
Prices change so often that you’ll likely see a different one by the time you actually arrive. That’s why we’ll have some fun with time series prediction models.
#civictech #solidjs #rust #ml #datascience
Prices change so often that you’ll likely see a different one by the time you actually arrive. That’s why we’ll have some fun with time series prediction models.
#civictech #solidjs #rust #ml #datascience
December 20, 2025 at 8:52 PM
A friend and I built mcsprit.de, a website to see real-time gasoline prices in Germany.
Prices change so often that you’ll likely see a different one by the time you actually arrive. That’s why we’ll have some fun with time series prediction models.
#civictech #solidjs #rust #ml #datascience
Prices change so often that you’ll likely see a different one by the time you actually arrive. That’s why we’ll have some fun with time series prediction models.
#civictech #solidjs #rust #ml #datascience
First 3d print for my #cyberdeck project turned out so well.
Measurement for all the parts were correct 🤯
But I forgot some parts 🙄
Anyway, super happy with the look and feel.
#raspberry #pi #3dprint
Measurement for all the parts were correct 🤯
But I forgot some parts 🙄
Anyway, super happy with the look and feel.
#raspberry #pi #3dprint
December 15, 2025 at 12:33 PM
First 3d print for my #cyberdeck project turned out so well.
Measurement for all the parts were correct 🤯
But I forgot some parts 🙄
Anyway, super happy with the look and feel.
#raspberry #pi #3dprint
Measurement for all the parts were correct 🤯
But I forgot some parts 🙄
Anyway, super happy with the look and feel.
#raspberry #pi #3dprint
Recently discovered the subreddit r/cyberdeck, and it's the coolest thing ever!
I'm now building one with two OLED displays, a 3×3 keypad, a dial, etc.
Can't wait for the first one to come out of the 3D printer.
The UI will be built with ratatui.
#cyberdeck #blender #3dprinting #rustlang #ratatui
I'm now building one with two OLED displays, a 3×3 keypad, a dial, etc.
Can't wait for the first one to come out of the 3D printer.
The UI will be built with ratatui.
#cyberdeck #blender #3dprinting #rustlang #ratatui
December 14, 2025 at 4:00 PM
Recently discovered the subreddit r/cyberdeck, and it's the coolest thing ever!
I'm now building one with two OLED displays, a 3×3 keypad, a dial, etc.
Can't wait for the first one to come out of the 3D printer.
The UI will be built with ratatui.
#cyberdeck #blender #3dprinting #rustlang #ratatui
I'm now building one with two OLED displays, a 3×3 keypad, a dial, etc.
Can't wait for the first one to come out of the 3D printer.
The UI will be built with ratatui.
#cyberdeck #blender #3dprinting #rustlang #ratatui
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: