Maarten Balliauw
@maartenballiauw.be
Head of Customer Success at @DuendeSoftware.com. Founded https://speaker.travel. Frequent speaker. Opinions are my own.
🔐 Let’s talk authentication! Join us September 29 in Essen for our next #VISUG meetup with Wesley Cabus and Maarten Balliauw. Two talks on ASP.NET Core Authentication and Passkeys, plus food & drinks. And yes, it’s free! 🍕🥤 #VISUG #ASPNETCore #DotNet #Community
ASP.NET Core Authentication Explained + Going Passwordless: A Practical Guide to Passkeys in ASP.NET Core — VISUG
Tuesday, 29 September 2026 • 18:00 • ODS Belgium B.V., Peepolderlaan 23, 2910 Essen
visug.be
If there’s one thing @maartenballiauw.be and @gotsharp.be know inside out, it’s authentication. Two true experts in their field, sharing their knowledge at #VISUG. Don’t miss this one! 👇
Visual Studio User Group@visug.bsky.social · 4d ago🔐 Let’s talk authentication! Join us September 29 in Essen for our next #VISUG meetup with Wesley Cabus and Maarten Balliauw. Two talks on ASP.NET Core Authentication and Passkeys, plus food & drinks. And yes, it’s free! 🍕🥤 #VISUG #ASPNETCore #DotNet #Community
How much time do you lose every week hunting for a document you know exists, but whose name completely escapes you? The solution: use proper tagging so your team knows how to find a document.
Just published a new issue of .NET R&D Digest! Thx to @rasbt.bsky.social, @maartenballiauw.be, @andrewlock.bsky.social, @kevingosse.net, @meziantou.net, @simonwillison.net & other authors for their g8 content! olegkarasik.wordpress.com/2026/08/04/n... #dotnet
.NET R&D Digest (July, 2026)
This issue includes bits of AI, Security, MS SQL, Performance, C#, HTTP and of course .NET and .NET Internals.
olegkarasik.wordpress.com
Blogged: Hosting the #dotnet #aspire Dashboard as a Standalone Container in #Azure Web Apps blog.maartenballiauw.be/posts/2026-0...
Hosting the .NET Aspire Dashboard as a Standalone Container in Azure Web Apps | Maarten Balliauw {blog}
Sometimes you just want a simple way to look at your traces, metrics, and logs without setting up a full observability stack. Just a UI where you can see what your applications are doing, without havi...
blog.maartenballiauw.be
Blogged: "Keyed Services (Named registrations) in .NET Service Provider" blog.maartenballiauw.be/posts/2026-0... #dotnet
Keyed Services (Named registrations) in .NET Service Provider | Maarten Balliauw {blog}
You have an IMessageSender interface, with two implementations: EmailMessageSender and SmsMessageSender. You register both, and now the question is which one gets injected into your OrderConfirmationS...
blog.maartenballiauw.be
Working with .TRX files? This is a pretty nifty @rider.jetbrains.com plugin. Allows you to load TRX files as unit test sessions, so the results are a whole lot easier to work with! plugins.jetbrains.com/plugin/25444...
TRX Test Reports - IntelliJ IDEs Plugin | Marketplace
This plugin provides support for TRX test report files in JetBrains Rider. It allows importing TRX files as unit test sessions, making it easier to work with test...
plugins.jetbrains.com
Blogged: So, I wrote a fiction book. Meet "The Side Project". Tried to add some background on the writing process and all. blog.maartenballiauw.be/posts/2026-0...
So, I wrote a fiction book. Meet "The Side Project". | Maarten Balliauw {blog}
For as long as I can remember, I’ve been writing non-fiction. Blog posts, documentation, technical guides, a couple of books about NuGet, and ASP.NET MVC 1.0 which still sells one copy per quarter, am...
blog.maartenballiauw.be
Blogged: TimeProvider and the End of Untestable DateTime.UtcNow blog.maartenballiauw.be/posts/2026-0... #dotnet #csharp
TimeProvider and the End of Untestable DateTime.Now | Maarten Balliauw {blog}
DateTime.Now is one of those calls that looks harmless until you try to write a test around it. It’s a static property that reads the system clock, and there’s no way to control what it returns withou...
blog.maartenballiauw.be
"Hey we see you spent 2000+ EUR on a flight, cool! Now pay 20 EUR for a seat, sucker. Oh that failed, no seat for you (we did charge though)" Thanks, Lufthansa. I feel such a valued customer.
Doing some evening work (US daytime) and GitHub actions takes forever to get an agent, builds are slower, ... Really noticeable compared to EU daytime.
Vacation starting soon. If you need some beach/pool/mountains/other reading... I recently published a book - The Side Project, about a dev whose innocent youth football app gets hijacked by organized crime. Check it out: books2read.com/u/bP2nll
Available now at your favorite digital store!
The Side Project by Maarten Balliauw
books2read.com
Every developer has a side project. Mine became... writing a book. Just published The Side Project, about a dev whose innocent youth football app gets hijacked by organized crime. Check it out: books2read.com/u/bP2nll
Available now at your favorite digital store!
The Side Project by Maarten Balliauw
books2read.com
Blogged: Discriminated unions in #csharp and #dotnet 11 (for real this time) blog.maartenballiauw.be/posts/2026-0...
Discriminated unions in C# and .NET 11 (for real this time) | Maarten Balliauw {blog}
Back in 2023, I wrote about discriminated unions in C# and how C# developers had to work around the lack of language support using things like ASP.NET Core’s Results<> type or the OneOf NuGet pac...
blog.maartenballiauw.be
Blogged: What is IdentityServer and When Do You Need it? blog.maartenballiauw.be/posts/2026-0... #dotnet
What is IdentityServer and When Do You Need it? | Maarten Balliauw {blog}
Earlier this week at Duende Software, we had a prospect reach out that wanted to implement IdentityServer in their solution. Their application consisted of one ASP.NET Core application with local user...
blog.maartenballiauw.be
Speaker desk with adjustable height. Love it @updateconference.bsky.social ! ❤️ #dotnet
Started our stream with @anders.abel.nu and @programmeral.com - First look at SAML in IdentityServer www.youtube.com/watch?v=o_tG... #dotnet
A First Look at Duende’s first-party SAML 2.0 support
YouTube video by Duende Software
youtube.com
Enjoyed working on this - duendesoftware.com/blog/2026040... Our docs, blog and samples repackaged for consumption when using AI tools. Skills benchmarked as well. Check these out if you are doing any #dotnet #aspnetcore identity work!
Give Your AI Coding Assistant Duende Expertise with Agent Skills and MCP Server
Announcing Duende Agent Skills and the Duende Documentation MCP Server. Two tools that give AI coding assistants deep knowledge of IdentityServer, BFF, and identity protocols.
duendesoftware.com
Going Passwordless - A Practical Guide to Passkeys in ASP .NET Core by @maartenballiauw.be www.youtube.com/watch?v=-BV2... #aspnetcore
2 intense meeting days and feeling like it's Friday. It's not 😅
Going live with @gotsharp.be - Are you sure your access tokens are really secure? www.youtube.com/watch?v=j_P4... #dotnet #identity
Are you sure your access tokens are really secure?
YouTube video by Duende Software
youtube.com
Doing one of those online security awareness trainings and seeing an older @nickchapsas.com in one of the videos.
Eating poutine, and there's Justin Bieber music in the background. How much more Canada can I get.
In-flight wifi on Swiss can go die in the tire fire it is.
I am at loss how public holidays in the US work. Seems more business as usual. Take the time off folks!
