Mattias Karlsson (he/him)

@devlead
620 Followers
359 Following
1.3K Posts
Partner & Technical fellow @wcomab
DevOps and Developer Tools Microsoft MVP.
.NET Foundation project / OSS maintainer.
Have been coding since the ’80s (C128 & Amiga).
Father of 2, and husband of 1.
Bloghttps://www.devlead.se
GitHubhttps://github.com/devlead
LinkedInhttps://www.linkedin.com/in/devlead
NuGethttps://www.nuget.org/profiles/devlead

Common Package Specification: Not the cross-ecosystem format the name suggests.

https://nesbitt.io/2026/04/13/common-package-specification.html

Common Package Specification

Not the cross-ecosystem format the name suggests.

Andrew Nesbitt
Last year we were at the edge of the abyss, but this year we took a giant leap forward.
Currently 30 m/s winds, got a feeling I won't get my steps today, keeping the dog walk short as trees are knocking on the cottage.
What version of Visual Studio are you using with xUnit.net?
VS 2019
0%
VS 2022 (< 17.8)
0%
VS 2022 (>= 17.8)
7.5%
VS 2026
92.5%
Poll ended at .
We will be removing Microsoft Testing Platform v1 support from the next major release, moving to v2 as the default. We will still support your ability to choose to disable MTP as well. #DotNet #UnitTest

I've created an integration testing framework for Azure Functions (dotnet-isolated) that provides a WebApplicationFactory-like experience. Please give it a try and tell me what you think.

https://github.com/bjorkstromm/azure-functions-test-framework

#dotnet #azure #azurefunctions

My new job has required I use Google's Firebase, and in particular Firestore. I've been surprised by the memory consumption of the official emulator, and wondered if I could hack together in .NET that meeds our needs. I still don't know, but this is the result so far: https://github.com/mikegoatly/FirestoreSharp

#dotnet #opensource #gcp

GitHub - mikegoatly/FirestoreSharp: An open source .NET emulator for Google Cloud Firestore

An open source .NET emulator for Google Cloud Firestore - mikegoatly/FirestoreSharp

GitHub
I wonder if we will eventually stop and ask, "Who are we doing this for?"
AI can be helpful and cool, but for some of my projects, there's a bonsai gardener feel to it. I code for me, when I want, with intent & precision. I guess some aspects of the trade will be like classic car maintenance🤔

We're doing a #livestream today around a first look at our User Management library here at Duende. Think of it as an alternative to #aspnetcore Identity. It let's you manage users (shocking I know 😅), and their profile, passwords, auth mechanisms, and more.

#dotnet #aspnetcore #aspnet

https://www.youtube.com/live/aPaTmi4-qQY?si=gpLYvMYE8MB8YEBU

A First Look at Duende User Management

YouTube
Dew Drop – March 23, 2026 (#4630) – Morning Dew by Alvin Ashcraft