Mattias Karlsson
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devlead.se
Mattias Karlsson
@devlead.se
Partner & Technical fellow at WCOM AB
DevOps and Developer Tools Microsoft MVP.
Been coding since the ’80s (C128 & Amiga).
Father of 2, husband of 1.
Occasionally blogs at https://devlead.se
Discord state management for what I've read or not seems to leave a little to be desired.
January 23, 2026 at 6:00 PM
Reposted by Mattias Karlsson
> We will ban you and ridicule you in public if you waste our time on crap reports

cURL vs LLM slop prs and security reports

Hats off for cURL

I hope that we soon will have better frameworks to help with open-source against this LLM slop
January 22, 2026 at 12:57 PM
Reposted by Mattias Karlsson
January 21, 2026 at 4:52 AM
Reposted by Mattias Karlsson
If you use Database Mail in SQL Server, you should not install SQL Server 2022 CU23 (which breaks Database Mail).

learn.microsoft.com/en-us/troubl...

#SQLServer #SQLServer2022
January 20, 2026 at 7:34 PM
Reposted by Mattias Karlsson
If you could run Øredev for a year, what would you do? 🤔

🚀 An inspiring idea for the theme this year?
👩‍🏫 A particular speaker you'd like to see (again)?
🛤️ A new track?
🎉 A sparkling idea that would make the official party take off?

We’d love to hear your ideas! 💌
January 19, 2026 at 7:53 AM
Reposted by Mattias Karlsson
My latest side project, this takes an MSBuild binlog file and transforms it into a Perfetto trace
msbuild-binlog-perfview.pages.dev
January 18, 2026 at 10:05 PM
Similar in C# & .NET 10 single-file app

"var rnd = new Random();while (true){Console.Write(rnd.Next(2) == 0 ? '╱' : '╲');}"|dotnet run -

#dotnet #csharp
January 18, 2026 at 3:52 PM
Reposted by Mattias Karlsson
There seems to be an ongoing supply chain attack or suspicious activity on NuGet .org, where a user called darklord is trying to gain legitimacy or something by sending thousands of become owner of their packages requests, don't accept, report to @nuget.org

#dotnet #nuget
January 17, 2026 at 10:27 AM
Reposted by Mattias Karlsson
I just released MIDICap (github.com/carlfranklin...) a Windows app that will play a MIDI file into a Piano and record the results to a WAV file. It solved a problem for me. Check out the README.
GitHub - carlfranklin/MIDICap
Contribute to carlfranklin/MIDICap development by creating an account on GitHub.
github.com
January 17, 2026 at 5:31 PM
So first he said we can't keep it safe, but when we move troops there we get punished 🤷
And still he hasitates to sanction Russia, which officially is the one he wants to defend against🫤
It's almost like it's not about national security at all 🤔
Trump just placed a tariff on most of the EU of 10% that will increase to 25% in June unless they agree to sell him Greenland.

This is mad king shit.
January 17, 2026 at 5:12 PM
US wine and beer sales still on decline in Sweden, down 20% just in January.
January 17, 2026 at 1:29 PM
Reposted by Mattias Karlsson
January 17, 2026 at 10:24 AM
Reposted by Mattias Karlsson
January 17, 2026 at 10:43 AM
Reposted by Mattias Karlsson
I took some time over the holidays to hack on an idea of a documentation for .NET solutions. There are so many things that can be done, but the first step is to make what already exists available:

NuDoc.NET creates cross-linked reference docs for any package on Nuget.org

nudoc.net/Docs/Sustain...
Sustainsys.Saml2 - NuDoc.NET
nudoc.net
January 16, 2026 at 9:19 AM
There seems to be an ongoing supply chain attack or suspicious activity on NuGet .org, where a user called darklord is trying to gain legitimacy or something by sending thousands of become owner of their packages requests, don't accept, report to @nuget.org

#dotnet #nuget
January 17, 2026 at 10:27 AM
Reposted by Mattias Karlsson
Looking for examples: do you know any OSS projects that have thoughtfully updated their contribution process for AI-assisted PRs?

Interested in:
* PR templates asking for intent/reasoning
* Comprehension checks
* Other friction-adding methods

Would love to learn from communities experimenting here
January 16, 2026 at 2:48 AM
Reposted by Mattias Karlsson
I was invited to the Tech Sharmit Podcast and had a lovely chat with Armit Sharma about building systems that last - across industries, cultures, and decades of technological change.

The episode is now published on YouTube:
youtu.be/J4SfmCrB_Rw?...
S1E143 – The Tech Sharmit Podcast: #MicrosoftMVP Mattias Karlsson | Expert Talks (TTSP)
YouTube video by Tech Sharmit
youtu.be
January 15, 2026 at 3:38 PM
Reposted by Mattias Karlsson
🎟️ Chocolatey Fest 2026 is coming!

We’re excited to announce Chocolatey Fest as a special track alongside the PowerShell + DevOps Global Summit.

Same event, more automation-focused goodness. 🍫⚙️

👉 More info & tickets: powershellsummit.org/
#Chocolatey #PSHSummit #Automation #PowerShell
January 15, 2026 at 8:49 PM
I was invited to the Tech Sharmit Podcast and had a lovely chat with Armit Sharma about building systems that last - across industries, cultures, and decades of technological change.

The episode is now published on YouTube:
youtu.be/J4SfmCrB_Rw?...
S1E143 – The Tech Sharmit Podcast: #MicrosoftMVP Mattias Karlsson | Expert Talks (TTSP)
YouTube video by Tech Sharmit
youtu.be
January 15, 2026 at 3:38 PM
Reposted by Mattias Karlsson
January 14, 2026 at 11:21 AM
Reposted by Mattias Karlsson
On 9 January 2026 mine and my family's lives changed forever.
I tell the full story in this video: youtu.be/mNEPSWcOheY

If you want to support my family as well as our local community, consider sharing this post, or donating here: www.gofundme.com/f/we-lost-al...
January 14, 2026 at 2:55 AM
I wonder what Snipping Tool notification ever might be classified as important to me...
January 12, 2026 at 2:44 PM
Reposted by Mattias Karlsson
lets see how this goes: Remove the Nuget Gallery "share on twitter" feature

github.com/NuGet/NuGetG...
NuGet/NuGetGallery
NuGet Gallery is a package repository that powers https://www.nuget.org. Use this repo for reporting NuGet.org issues. - NuGet/NuGetGallery
github.com
January 5, 2026 at 8:53 AM
Reposted by Mattias Karlsson
Hey #PowerShell peeps! The new auto complete thing in VSCode is messing up our terminals. It doesn't auto complete actual functions. Give this an upvote to get a fix in to the backlog and (hopefully) improve it!
github.com/microsoft/vs...

(And share onwards for visibly. Can't have a bad terminal)
Terminal suggest doesn't get content from the actual terminal session. · Issue #285640 · microsoft/vscode
Does this issue occur when all extensions are disabled?: Yes/No Yes Terminal auto suggest entries are not based on actual terminal functions, and suggestions are therefore not correct. If I create ...
github.com
January 6, 2026 at 9:15 AM
Reposted by Mattias Karlsson
WebAssembly is still for me one of the underestimated pieces in the IT landscape. Here a small POC, to store a WASM on RustFS and execute it on an API call. Just for fun and demonstration 🙂

github.com/oxide-byte/w...

#rustlang #webassembly #serverless
GitHub - oxide-byte/wasm-faas: WASM-FaaS Platform for uploading WASM files to RustFS and download for executing with an API
WASM-FaaS Platform for uploading WASM files to RustFS and download for executing with an API - oxide-byte/wasm-faas
github.com
January 7, 2026 at 7:13 AM