Mattias Karlsson
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devlead.se
Mattias Karlsson
@devlead.se
2.4K followers 600 following 1.9K posts
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
Posts Replies Media Videos
Reposted by Mattias Karlsson
gaprogman.com
𝟭/𝟯: The .NET community is full of people building amazing things, and I want to help share those stories. The Modern .NET Show is booking guests for March 2026 onwards. If you've got a project, library, or experience worth discussing, let's record an episode.
December 5, 2025 at 1:01 PM
Reposted by Mattias Karlsson
blowdart.me
Publishing NuGet packages from a Github Action without secrets
Publishing NuGet packages from a Github Action without secrets
This guide will walk you through using a combination of GitHub actions and NuGet publishing policies to push packages to nuget.org from within an action without needing to worry about API keys.
idunno.org
December 5, 2025 at 10:59 AM
Reposted by Mattias Karlsson
devlead.se
Each track also conveniently has it's own playlist, I'm going to start with the @oredev.org #dotnet track😎
www.youtube.com/watch?v=WzQ_...
Mattias Karlsson - GitHub Actions DevOps Pipelines as Code using C# and Cake SDK
YouTube video by Øredev Conference
www.youtube.com
December 4, 2025 at 8:48 AM
Reposted by Mattias Karlsson
devlead.se
The @oredev.org 2025 recordings are now up on YouTube. I will need to catch up on all the sessions I missed, loads of knowledge, and content.

www.youtube.com/watch?v=tVTw...
Opening act by Absurdum Temporary Art
YouTube video by Øredev Conference
www.youtube.com
December 4, 2025 at 8:48 AM
devlead.se
The @oredev.org 2025 recordings are now up on YouTube. I will need to catch up on all the sessions I missed, loads of knowledge, and content.

www.youtube.com/watch?v=tVTw...
Opening act by Absurdum Temporary Art
YouTube video by Øredev Conference
www.youtube.com
December 4, 2025 at 8:48 AM
Reposted by Mattias Karlsson
rangemarten.bsky.social
November 29, 2025 at 9:13 PM
Reposted by Mattias Karlsson
rangemarten.bsky.social
Shader/Demo/cool stuff advent calendar is live: github.com/MagnusThor/s...
GitHub - MagnusThor/so-you-think-you-can-code-2025: 🎄 So You Think You Can Code? 2025! Advent Calendar for geeks: from Shaders & Robotics to Web apps, Rust tricks & Retro code. Submit your best!
🎄 So You Think You Can Code? 2025! Advent Calendar for geeks: from Shaders & Robotics to Web apps, Rust tricks & Retro code. Submit your best! - MagnusThor/so-you-think-you-can-code-2025
github.com
December 1, 2025 at 8:55 AM
Reposted by Mattias Karlsson
oredev.org
You asked, we delivered!
Our To Infinity & Beyond merch is now live — coral tee, grey hoodie, and gymbag.
Limited drop with Malmö Printing Co, open until 19 Dec. Ships to EU, UK & US.
Grab yours while it lasts! 🚀

👉 #oredevp/#oredev" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky">https://www.malmoprinting.co/shop/#oredev
December 1, 2025 at 6:00 AM
devlead.se
Wish people asked before just forwarding emails not written with that audience in mind, even if nothing factual wrong you might have had slightly different wording to avoid misunderstandings.
November 29, 2025 at 10:52 PM
devlead.se
🤩
rangemarten.bsky.social rangemarten.bsky.social @rangemarten.bsky.social · 7d
Bit of path tracing (might not work on mobiles for technical reasons):
www.shadertoy.com/view/WcVcR1
Futuristic city with atari logo slapped on it.
November 29, 2025 at 4:37 PM
Reposted by Mattias Karlsson
grishund.bsky.social
Påminner om att ingen syns i mörkret just nu. Reflexer på!
November 28, 2025 at 3:28 PM
Reposted by Mattias Karlsson
cakecontrib.bsky.social
🚀 Black Friday vibes for build lovers
Cake Contrib has over 300 @cakebuild.net add-ins ready to power up your automation for the unbeatable price of free

Explore the goodies 🍰
👉 www.nuget.org/profiles/cak...

#BlackFriday #dotnet #NuGet #CakeBuild #CakeContrib #OpenSource #devops
NuGet Gallery | cake-contrib
www.nuget.org
November 28, 2025 at 11:08 AM
Reposted by Mattias Karlsson
cakebuild.net
🛒✨ Black Friday deal!
The Cake Build toolbox is freshly baked and ready to level up your builds for the unbeatable price of completely free!

Treat your pipelines to something sweet 🍰
👉 cakebuild.net/docs/running...

#BlackFriday #dotnet #CakeBuild #OpenSource #devops #csharp
Cake - Runners
cakebuild.net
November 28, 2025 at 11:03 AM
Reposted by Mattias Karlsson
devlead.se
Did you know @dot.net @microsoftdevdocs.bsky.social are open-source and accept community contributions?

So if you find a typo or something missing, you can send a pull request by hitting the edit button📝

"dotnet project convert" was missing, a PR later:
learn.microsoft.com/en-us/dotnet...

#dotnet
Screenshot of table of contents, which now contains "dotnet project convert"
November 26, 2025 at 8:20 PM
Reposted by Mattias Karlsson
dotnetfoundation.org
While build & release pipelines are often created in YAML/JSON/XML, using C# offers clearer control flow. This session shows managing GitHub Actions pipelines with C#, Cake SDK & .NET 10, enabling local testing & debugging in VSCode.
hubs.li/Q03VJlxp0 #dotnet #dotnetconf
November 26, 2025 at 2:23 PM
devlead.se
Did you know @dot.net @microsoftdevdocs.bsky.social are open-source and accept community contributions?

So if you find a typo or something missing, you can send a pull request by hitting the edit button📝

"dotnet project convert" was missing, a PR later:
learn.microsoft.com/en-us/dotnet...

#dotnet
Screenshot of table of contents, which now contains "dotnet project convert"
November 26, 2025 at 8:20 PM
devlead.se
Rarely are awards given to an OSS project for being dependable, non-volatile, and well-maintained.
But for one's dependencies, boring can be a good low-friction get shit done place to be.
November 25, 2025 at 9:19 AM
devlead.se
I'm going to have a harsh discussion with whoever wrote this code… though it'll probably end up being a monologue.
November 24, 2025 at 7:19 PM
Reposted by Mattias Karlsson
devlead.se
Thanks to all who came to my .NET Conf session, you can watch it again at
www.youtube.com/watch?v=e7hk...

The presentation is available at dotnetconf2025.azurevoodoo.net & the sample github.com/azurevoodoo/...

Cake 6.0 & Sdk launch blog post cakebuild.net/blog/2025/11...

#dotnet #devops #csharp
GitHub Actions DevOps Pipelines as Code using C# and Cake SDK
YouTube video by dotnet
www.youtube.com
November 14, 2025 at 8:34 AM
devlead.se
Nice to see the personal to-do list of getting projects onto using NuGet OIDC and .NET 10 getting shorter. When you maintain more than 50 projects, it takes an evening or two, but nice not to have to care about expiring tokens again. Now just need @nuget.org to support Azure Trusted Signing😎
#dotnet
November 23, 2025 at 10:12 PM
Reposted by Mattias Karlsson
tyrrrz.me
GitHubActionsTestLogger now has support for Microsoft.Testing.Platform!

Thanks a lot to @martincostello.com for testing and debugging.

github.com/Tyrrrz/GitHu...
November 23, 2025 at 6:24 PM
Reposted by Mattias Karlsson
linebreakers.band
GIG ALERT! Friday 5 December, we're throwing a Build Stuff afterparty at Alaus Namai in Vilnius! A night of live tech comedy video disco alt pop punk rock'n'roll with @dylanbeatt.ie, @rendle.dev, @eli.holderness.dev, @vagifabilov.bsky.social and Hannes Lowette.

Doors 19:00! FREE!

See you there! 🤘🏼
The greatest tech disco video comedy pop punk party rock'n'roll band in the world - THE LINEBREAKERS, live at Alaus Namai, A Goštauto g 8, Vilnius, straight after Build Stuff.
November 23, 2025 at 5:45 PM
Reposted by Mattias Karlsson
chadbourn.bsky.social
Tusk slips the knife in right at the end.
Post Donald Tusk * @donaldtusk Together with the leaders of Europe, Canada and Japan, we have declared our readiness to work on the 28-point plan despite some reservations. However, before we start our work, it would be good to know for sure who is the author of the plan and where was it created. G...
November 23, 2025 at 11:21 AM
devlead.se
🌊I am usually not a mono-repo person, but it works well for projects in maintenance mode. It turns PRs from a tsunami-style whack-a-mole problem into a calm wave when new SDKs and shared libraries are released. So "graduated" projects are automatically versioned, built, and shipped together.
#devops
November 23, 2025 at 2:07 PM
devlead.se
Note to self, apparently inbox zero is just an MX record away...
November 20, 2025 at 4:31 PM