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
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
Discord state management for what I've read or not seems to leave a little to be desired.
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
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
> 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
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
Reposted by Mattias Karlsson
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
learn.microsoft.com/en-us/troubl...
#SQLServer #SQLServer2022
January 20, 2026 at 7:34 PM
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
learn.microsoft.com/en-us/troubl...
#SQLServer #SQLServer2022
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! 💌
🚀 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
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! 💌
🚀 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! 💌
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
msbuild-binlog-perfview.pages.dev
January 18, 2026 at 10:05 PM
My latest side project, this takes an MSBuild binlog file and transforms it into a Perfetto trace
msbuild-binlog-perfview.pages.dev
msbuild-binlog-perfview.pages.dev
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
#dotnet #nuget
January 17, 2026 at 10:27 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
#dotnet #nuget
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
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.
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 🤔
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.
This is mad king shit.
January 17, 2026 at 5:12 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 🤔
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 🤔
US wine and beer sales still on decline in Sweden, down 20% just in January.
January 17, 2026 at 1:29 PM
US wine and beer sales still on decline in Sweden, down 20% just in January.
Reposted by Mattias Karlsson
NuGet gallery supply chain attack? https://old.reddit.com/r/dotnet/comments/1qf9lnp/nuget_gallery_supply_chain_attack/
#dotnet
#dotnet
January 17, 2026 at 10:24 AM
NuGet gallery supply chain attack? https://old.reddit.com/r/dotnet/comments/1qf9lnp/nuget_gallery_supply_chain_attack/
#dotnet
#dotnet
Reposted by Mattias Karlsson
NuGet gallery supply chain attack? https://old.reddit.com/r/csharp/comments/1qf9wis/nuget_gallery_supply_chain_attack/
#csharp #dotnet
#csharp #dotnet
January 17, 2026 at 10:43 AM
NuGet gallery supply chain attack? https://old.reddit.com/r/csharp/comments/1qf9wis/nuget_gallery_supply_chain_attack/
#csharp #dotnet
#csharp #dotnet
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...
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
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...
NuDoc.NET creates cross-linked reference docs for any package on Nuget.org
nudoc.net/Docs/Sustain...
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
#dotnet #nuget
January 17, 2026 at 10:27 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
#dotnet #nuget
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
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
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
Interested in:
* PR templates asking for intent/reasoning
* Comprehension checks
* Other friction-adding methods
Would love to learn from communities experimenting here
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?...
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
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?...
The episode is now published on YouTube:
youtu.be/J4SfmCrB_Rw?...
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
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
🎟️ 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
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
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?...
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
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?...
The episode is now published on YouTube:
youtu.be/J4SfmCrB_Rw?...
Reposted by Mattias Karlsson
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...
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
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...
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...
I wonder what Snipping Tool notification ever might be classified as important to me...
January 12, 2026 at 2:44 PM
I wonder what Snipping Tool notification ever might be classified as important to me...
Reposted by Mattias Karlsson
lets see how this goes: Remove the Nuget Gallery "share on twitter" feature
github.com/NuGet/NuGetG...
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
lets see how this goes: Remove the Nuget Gallery "share on twitter" feature
github.com/NuGet/NuGetG...
github.com/NuGet/NuGetG...
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)
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
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)
github.com/microsoft/vs...
(And share onwards for visibly. Can't have a bad terminal)
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.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
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.com/oxide-byte/w...
#rustlang #webassembly #serverless